C Practicles

7/31/2019 C Practicles

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C PracticleExample codes for C programming practicle questions

(Refere on your own risk. No author responsibility on its accuracy.)


2/22

#include//we have to include math.h library to use sqrt() which is implemented within it

#include

void main(){

printf("Number\tSquare\tSquare Root");

printf("\n------\t-------\t-----------\n");

int num=0;for(num=1;num


3/22

#include

void main(){

int fatherAge=0;

int sonAge=0;

printf("Enter the father's age.......");

scanf("%d",&fatherAge);

printf("Enter the son's age.......");scanf("%d",&sonAge);

//Logic to calculate when father's age become double as son's agewhile(fatherAge!=2*sonAge){

fatherAge++;sonAge++;

}

printf("Father age.... %d\n",fatherAge);

printf("Son age.... %d\n",sonAge);

}


4/22

#include

//I was unable to get the sharp end of the triangle. You can try for it.

void main(){

int col=0;

int row=0;int count=1;

for(row=0;rowrow;col--){ //creates a triangle with stars on right side. Upside downtriangle.printf("*");

}count++;

}

printf("\n");}


5/22

#include

void main(){

//Answer for 1

int numbers[10]={3,4,5,6,7,8,2,1,9,23};

int count=0;

while(count


6/22

int noOfChars=0;#include

main(){

printf("Enter the number of the characters of your name....");scanf("%d",&noOfChars); //C array length should be predefined

noOfChars=noOfChars+1;

char name[noOfChars];

count=0;

printf("Enter your name.....");

while(count=0){

printf("%c",name[count]);count--;

}printf("\n");

}


7/22

#include

main(){count=0;

int count2=0;

int noOfSameItems=0;int checkOccu=1;

int numElements[20]={2,6,8,1,3,4,7,2,2,5,6,8,9,3,1,1,2,5,8,4};

int controller=0;

while(count


8/22

#include

void main(){

FILE *fp;

char c;

float total=0;int count=-1;

int minimum=0;

int maximum=0;

fp=fopen("value.txt","r");

if(fp!=NULL){

c=getc(fp);

//c1=c;

minimum=atoi(&c);

maximum=atoi(&c);//printf("%c",c);

while(c!=EOF){

if(c != ' '){count++;

}

total=total+atoi(&c); // atoi() converts char to int

if(maximumatoi(&c)){

minimum=atoi(&c);

}


9/22

c=getc(fp);

}fclose(fp);

printf("Summation of values.......%.2f\n",total);printf("Average of values.......%.2f\n",total/count);

printf("Minimum of values.......%d\n",minimum);

printf("Maximum of values.......%d\n",maximum);

}

}


10/22

#include

void oddNum();// function signature of 'oddNum()' to indicate it initially

main(){

oddNum(); //call to oddNum()

}

void oddNum(){//function to find odd numbersint fNum=20;

FILE *fp;

fp=fopen("odd.txt","w"); //connect with the text file names odd.txt with the 'writing

perspective'

while(fNum


11/22

#include

#include

void main(){

int looper=0;

while(looper==0){ //This loop is for continuity of the program. this will loop until no 3 is entered

int itemNo=0;

FILE *fp; //FILE pointer for write to file

FILE *fpRead; //FILE pointer for read from file

fp=fopen("directory.txt","a"); //create a connection to append to File directory.txt

fpRead=fopen("directory.txt","r"); //create a connection to read File directory.txt

char name[256]; //Used to store a string which is lenght of 256 chars

char stuID[10];

char phoneNo[12];char eMail[100];

char *result;char word[50];

printf(".......................Menu.......................\n");

printf("1-Add new contact\n");


12/22

printf("2-Show contacts\n");

printf("3-Exit\n");printf("..................................................\n");

printf("Enter menu no....");scanf("%d",&itemNo);

switch(itemNo){

case 1: //this part will do appendings to the text filefgets(name,25,stdin);

printf("Enter your name....");fgets(name,256,stdin); //get the user input through terminal.'name' is the array name where

will be the string stored.'stdin' stands for keyboard input

fputs(name,fp); //output is saved on the text file. 'name' is the array where name of theperson is stored. 'fp' is the name of the pointer

printf("Enter your Student ID....");fgets(stuID,10,stdin);

fputs(stuID,fp);printf("Enter your phoneNo....");

fgets(phoneNo,12,stdin);fputs(phoneNo,fp);

printf("Enter your E-Mail....");

fgets(eMail,100,stdin);fputs(eMail,fp);

fputs("\n",fp);

fclose(fp); //close the file coonnection

break;

case 2: //read from text file and print on terminalprintf("---------------contact Info----------------------\n");

printf("Name \t ID \t Phone No \t E-Mail \n\n");

do{fscanf(fpRead, "%s%s%s%s", name, stuID,phoneNo,eMail); //get the data from text file to

above arrys named 'name','stuID' etc.fprintf(stdout, "%s \t %s \t %s \t %s \t\n", name, stuID,phoneNo,eMail);//print the data on

terminal with data from above arrysresult=fgets(word,50,fpRead); //this is for loop condition}while(result!=NULL); //loop will be executed until there is nothing in text file

printf("-------------------------------------------------\n");fclose(fpRead); //break the connection with text file

break;

case 3:exit(1); //exit from the program

break;}

}

}


13/22

#include#include

main(){

FILE *voltageFp; //pointer to point text file where voltages are storedFILE *resistanceFp; //pointer to point text file where resistances are stored

FILE *fp; ////pointer to point text file where voltages are stored only for while loop condition

int voltage=0; //variable to store received voltage value from the file

int resistance=0; //variable to store received resistance value from the filechar *result;

char word[60];float totalPower=0;

float max;

float maxPower;

voltageFp=fopen("voltage.txt","r"); //point the file to read.(text File contains voltage values)

resistanceFp=fopen("resistance.txt","r"); //(text file contains resistance values for given voltages)fp=fopen("resistance.txt","r");

do{

fscanf(voltageFp,"%d",&voltage); //read data as integers from the text filefscanf(resistanceFp,"%d",&resistance);

totalPower=totalPower+((voltage*voltage)/resistance);if(max


14/22

}while(result!=NULL); //executes the loop until 'result' get null at the end

//There is a logical error. Loop doesn't stop at the end. Repeat the last line twise.

fclose(voltageFp);

fclose(resistanceFp);printf("Total power consumption of the circuit = %.2f\n",totalPower);

printf("Maximum power consuming resistor of the circuit = %.2f\n",max);printf("Voltage of the maximum power consuming resistor = %.2f\n",maxPower);

}


15/22

#include

#include

//in C we have to indicate about the function below main() at the begining of the source usingfunction signature

void inputFile();

void outputFile(char *blank);

main(){

inputFile(); //executes the inputFile()}

void inputFile(){

FILE *input;

input=fopen("unedited.txt","r");//there are more than one space between two words in the text file.

char text[1000];char blank[1000];

int location = 0;

int blankLocation=0;

fgets(text,999,input); //initially takes a string to char array 'text'

while (text[location] != '\0') //loop executes until 'text' is not null

{//condition becomes true if there is no another space or tab soon after a space or tab

if (!((text[location] == ' ' && text[location+1] == ' ') || (text[location] == '\t' && text[location+1]== '\t'))) {

blank[blankLocation] = text[location];

blankLocation++;

}location++;

fgets(text,999,input);

}

blank[blankLocation] = '\0';outputFile(blank);// parse the char array blank to output()

}


16/22

void outputFile(char *blank){//In C we cannot define arrays for parameter list so we can use apointer instead of that

FILE *output;

output=fopen("edited.txt","w");int counter=0;

for(counter=0;counter


17/22

#include

#include

main(){

char area[50];printf("Enter area..... ");

gets(area);//gets the area as a system input

FILE *inputFile;

char fName[200];char lName[200];

char location[100];char tpn[50];

char *result;char buffer[200];

inputFile=fopen("info.txt","r");

do{

fscanf(inputFile,"%s%s%s%s",fName,lName,location,tpn);

if(strcmp(location,area)==0){ //compare the system input area with file input area '0' indicates trueand '1' indicate false

printf("%s\n%s\n%s\n%s\n",fName,lName,location,tpn);

}else{

}

result=fgets(buffer,199,inputFile);}while(result!=NULL);

}


18/22

#include

#include

void calSubAvg();void appendMarks(); //indicate about the function at the begining by using the function signature

void calStuAvg();

main(){

int choice=0;while(1>0){ //continuity of program until user decide to stop

printf("1- Input student data\n2- Calculate average of each subject\n3- Calculate average of eachstudent\n0- Exit\n");

printf("Input your choice no.....");

scanf("%d",&choice);

switch(choice){

case 1:appendMarks(); //call the function

break;case 2:calSubAvg();

break;case 3:calStuAvg();

break;

default:exit(0);

}

}

}

void appendMarks(){ //function to append marks

char indexNo[10];char mark1[5];

char mark2[5];char mark3[5];

char mark4[5];

printf("Enter the index no......");

gets(indexNo);


19/22

gets(indexNo); //gets the input as strings to a char array

printf("Enter the mark 1......");

gets(mark1);


gets(mark2);


gets(mark3);

printf("Enter the mark 4......");gets(mark4);

FILE *outputFile;

outputFile=fopen("markList.txt","a");

fprintf(outputFile,"%s\t%s\t%s\t%s\t%s\n",indexNo,mark1,mark2,mark3,mark4);//print the data totext file keeping a tab between two data items

fclose(outputFile);

}

void calStuAvg(){ //function to calculate average mark of each student

char indexNoIn[10];int mark1In;

int mark2In;int mark3In;

int mark4In;

char *result;char text[10];

FILE *inputFile;

inputFile=fopen("markList.txt","r");do{fscanf(inputFile,"%s\t%d\t%d\t%d\t

%d",indexNoIn,&mark1In,&mark2In,&mark3In,&mark4In);//read data from text file. when weread data as integer values to a int variabl, we should call variable's memory location with '&'

printf("%s\t%.2f\n",indexNoIn,(mark1In+mark2In+mark3In+mark4In)/4.0); //4.0 to convert int

result to floatresult=fgets(text,9,inputFile);

}while(result!=NULL);

fclose(inputFile);

}


20/22

void calSubAvg(){ //function to calculate average mark to each subject

float counter=0;

int mark1=0;

int mark2=0;

int mark3=0;int mark4=0;

char indexNo[10];

int mark1Total=0;

int mark2Total=0;int mark3Total=0;

int mark4Total=0;

char *result;char text[10];

FILE *inputFile;

inputFile=fopen("markList.txt","r");

do{fscanf(inputFile,"%s\t%d\t%d\t%d\t%d",indexNo,&mark1,&mark2,&mark3,&mark4);

mark1Total=mark1Total+mark1;//calculate total of mark1

mark2Total=mark2Total+mark2;

mark3Total=mark3Total+mark3;mark4Total=mark4Total+mark4;

counter++; //count the number of studentsresult=fgets(text,9,inputFile);

}while(result!=NULL);

printf("Average of mark1...%.2f\n",mark1Total/counter);printf("Average of mark2...%.2f\n",mark2Total/counter);

printf("Average of mark3...%.2f\n",mark3Total/counter);printf("Average of mark4...%.2f\n",mark4Total/counter);

fclose(inputFile);

}


21/22

#include

struct weather //structure to store weather information

{int rainfall[24];

float wind_speed;

float temperature;};

main(){

int hours=0;

int cummulativeRaunFall=0;

struct weather day; //creates a structure with the reference name 'day'

printf("Enter the weather......");

while(hours


22/22

hours++;

}

printf("\n\n\n-----------------------The weather Information----------------------------------");

printf("Cummulative rainfall.......%d\n",cummulativeRaunFall);printf("Wind Speed.......%f\n",day.wind_speed);

printf("Temperature.......%f\n",day.temperature);printf("--------------------------------------------------------------------------------");

}

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