...输入两个整数x,y,分别调用sum函数 求他们的和,调用sub函数 求...答:int sum(int x,int y);int sub(int x, int y);void main(){ int x,y,sum,sub;scanf("%d,%d",&x,&y);sum = sum(int x,int y);printf("x+y = %d",sum);sub = sub(int x ,int y);printf("x-y = %d",sum);} int sum(int x,int y){ return (x+y);} int sub...