第一个C语言程序

#include <stdio.h> 
int main() 
{ 
 printf("Hello World!\n"); 
 return 0; 
}

# include <stdio.h>

int main(){
	printf("%d\n",23+43);
} 

# include <stdio.h>

int main(){
	printf("23+43=%d\n",23+43);
} 

#include <stdio.h>

int main()
{
    int price = 0;

    printf("请输入金额（元）：");
    scanf("%d", &price);

    int change = 100 - price;

    printf("找您%d元。\n", change);

    return 0;
}