C语言程序设计代码示例

1.

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

2.

#include <stdio.h>
#include <math.h>
int main()
{
    float a,b;
    printf("in put a number \n");
    scanf("%f",&a);
    b = sin(a);
    printf("sin(%f) is %lf",a,b);
    return 0;
   

}

3.