#include <stdio.h> int main(void) { int x,y; printf("Enter x:"); scanf("%d",&x); if(x<0){ y=-1; } else if(x==0){ y=0; } else{ y=1; } printf("y=%d ",y); return 0; }
#include <stdio.h> int main(void) { int count,i,n; double grade,total; printf("Enter n:"); scanf("%d",&n); total=0; count=0; for(i=1;i<=n;i++){ printf("Enter grade:",i); scanf("%lf",&grade); total=total+grade; if(grade>60){ count++; } } printf("Grade average=%.2f ",total/n); printf("Number of successful=%d ",count); return 0; }
#include <stdio.h> int main(void) { int blank,digit,letter,other; char ch; int i; blank=digit=letter=other=0; printf("Enter 15 characters:"); for(i=1;i<=15;i++){ ch=getchar( ); if((ch>='a'&&ch<='z')||(ch>='A'&&ch<='Z')) letter++; else if(ch>='0'&&ch<='9') digit++; else if((ch=' ')&&ch<=' ') blank++; else other++; } printf("blank=%d,letter=%d,digit=%d,other=%d ",blank,letter,digit,other); return 0; }
#include<stdio.h> int main(void) { int i,year,n; printf("Enter n:"); scanf("%d",&n); for(i=1;i<=n;i++){ printf("Enter year:"); scanf("%d",&year); if((year%4==0&&year%100!=0)||(year%400==0)){ printf("该年是闰年 "); } else{ printf("该年不是闰年 "); } } return 0; }
#include<stdio.h> int main(void) { char ch; printf("enter Level: "); ch=getchar(); switch(ch){ case 'A':printf("%c 90-100 ",ch);break; case 'B':printf("%c 80-89 ",ch);break; case 'C':printf("%c 70-79 ",ch);break; case 'D':printf("%c 60-69 ",ch);break; case 'E':printf("%c 0-59 ",ch);break; default: printf("0 "); } return 0; }
#include<stdio.h> int main(void) { int choice,i; double price; for(i=1;i<=5;i++){ printf("[1]Select apples "); printf("[2]Select pears "); printf("[3]Select oranges "); printf("[4]Select grapes "); printf("[0]exit "); printf("Enter choice:"); scanf("%d",&choice); if(choice==0) break; switch(choice){ case 1:price=3.00;break; case 2:price=2.50;break; case 3:price=4.10;break; case 4:price=10.20;break; default:price=0.00;break; } printf("price=%0.2f ",price); } return 0; }