int a;int b;printf("a,b");scanf("%d %d", &a, &b);//需要校验输入值if (a <= 0 || b <=0){printf("输入的数据不是正整数。a=%d b=%d", a, b);return -1;}printf("%d + %d = %d\n", a, b, a + b);printf("%d - %d = %d\n", a, b, a - b);printf("%d * %...