//编写一个程序,输入一个x的值,要求输出相应的y值(x<0,y=-1;x=0,y=0;x>0y=1)
//程序1.
#define _CRT_SECURE_NO_WARNINGS
#include <stdio.h>
#include <stdlib.h>
int main(){
int x, y;
scanf("%d", &x);
if (x < 0)
y = -1;
else
if (x == 0) y = 0;
else
y = 1;
printf("x=%d y=%d\n", x, y);
system("pause");
return 0;
}
//程序2.
#define _CRT_SECURE_NO_WARNINGS
#include <stdio.h>
#include <stdlib.h>
int main(){
int x, y;
scanf("%d", &x);
if (x >= 0)
if (x > 0) y = 1;
else y = 0;
else y = -1;
printf("%d", y);
system("pause");
return 0;
}
运行结果
实现1~100的和
#include <stdio.h>
#include <stdlib.h>
int main(){
int i=1;
int n=0;
for (i; i <= 100; i++){
n = i + n;
}
printf("%d\n", n);
system("pause");
return 0;
}
#include <stdio.h>
#include <stdio.h>
int main(){
int i = 1;
int n = 0;
while (i <= 100){
n = i + n;
i++;
}
printf("%d\n", n);
system("pause");
return 0;
}
#include <stdio.h>
#include <stdio.h>
int main(){
int i = 0;
int n = 0;
do {
i++;
n = i + n;
} while (i < 100);
printf("%d\n", n);
system("pause");
return 0;
}
运行结果