要求以c语言,编写几个子函数(至少4个子函数),然后用主函数调用子函数来...答:zhengchu(int a,int b){if(!b)return 0;else return a/b;}int mod(int a,int b){if(!b)return 0;else return a%b;}int main(){int x=5,y=2;printf("x+y=%d\n",jia(x,y));printf("x-y=%d\n",jian(x,y));printf("x*y=%d\n",cheng(x,y));printf("x/y=%d....