一道c语言编程题，图如下，请问如何编写程序，急急急😞，求大神帮忙

#include int sum(int a,int b){ return a+b;}int main(void) { int num1,num2; printf("input num1 & num2:"); scanf("%d%d",&num1,&num2); printf("%d\n",sum(num1,num2)); return 0;}