擅长c语言的友友们帮帮我

友友们，这两道题用c语言怎么写呀？我真的不会呀，做了一个多小时了，都运行不成功，到底怎么做呀

#include <stdio.h>
int main()
{
int per;
scanf("%d", &per);
printf("xuefen = 17, xuefei = %d", 17 * per);
return 0;
}

#include <stdio.h>
int main()
{
int per;
float shf;
scanf("%d", &per);
scanf("%f", &shf)
printf("%.2f", (per*17+5*shf)*0.6);
return 0;
}