C语言及程序设计提高例程-10 调试技术：进入函数内部去

#include <stdio.h>
float max(float x, float y);
int main ()
{
    float a,b,c;
    scanf("%f %f", &a, &b);
    c = max(a, b) ;
    printf("The max is %f\n", c);
    return 0;
}
float max(float x, float y)
{
    float z;
    z=(x<y)? x : y ;
    return  z;
}