Computer Programming.docx

Computer Programming

Dennis Ritchie .. 1972 UNIX DEC PDP-11 B Ken Thompon BCPL Martin Richards

Martin Richards Ken Thom pson Dennis Ritchie

Void main() {}1. 2 2 int number1,number2,sum;

printf("please your number 1:");Scanf

#include void main(){int number1,number2,sum;printf("please your number 1:");scanf("%d",&number1);printf("please your number 2:");scanf("%d",&number2);sum = number1+number2;printf("%d + %d = %d",number1,number2,sum);}

compile &run

compile &run

Enter 2. .. . Please inser ceB.D? Int ce,543,sum;

#include void main(){int ce,ba,sum;printf("please intsert ce:");scanf("%d",&ce);sum = ce+543;printf("%d +543 = %d",ce,sum);}

compile &run

compile &run 2002 2545

3. a-z 97-122

a-z a-z 97-122

#include "stdio.h"void main (){char A = 'a';A = A + 15;printf("%c",A);}

p F11

4. // /*_______*/

Hello#include "stdio.h"void main(){char greeting[6]={ 'H','e','l','l','o','\0'};printf("Greeting message %s\n",greeting);return 0;}

5. Hello world#include "stdio.h"void main(){ char greeting[13]= "hello world"; printf("Greeting message %s\n",greeting); return 0;}

6. #include "stdio.h"//??????? include ??????????#include void main(){char s[100];printf("Input string : ");gets(s);printf("\n\nString(%s) length is (%d)\n\n",s, strlen(s));return 0;}

F11

Enter

7. x () x 1. 2 - x () x A1

h

A2

A1,A2,h,area

#include #includevoid main(){ printf("How to find the area of a trapezoid?\n"); printf("********************************************** \n"); float h,A1,A2,area; printf("Height is "); scanf("%f",&h); printf("A1 is "); scanf("%f",&A1); printf("A2 is "); scanf("%f",&A2); printf("How to do.\n"); printf("Formula=1/2*(A1+A2)*h \n"); area=(A1+A2)*h/2; printf("Area of trapezoid= %.2f",area); getch();}

#includevoid main(){float a,b,c,d,mean1;printf("input number1:");scanf("%f",&a); printf("input number2:");scanf("%f",&b);printf("input number3:");scanf("%f",&c);printf("input number4:");scanf("%f",&d);mean1=(a+b+c+d)/4;printf("%f,%f,%f,%f mean is :%f",a,b,c,d,mean1);}

F11 Enter

8. A = 100 80B+ =79 75B = 74 70C+ = 69 65C = 64 60D+ = 59 55D = 54 50

#include "stdio.h"void main(){ int score;printf("Please input your score");scanf("%d",&score);if((score>=80)&&(score=75)&&(score=70)&&(score=65)&&(score=60)&&(score=55)&&(score=50)&&(score