执行以下程序，若输入为50*20，则输出结果为。#includeint main(){char op;int a,b;scanf_s("%d%c%d",&a,&op,1,&b);switch(op){case '+':printf("%d+%d=%d\n",a,b,a+b);break;case '-': printf("%d-%d=%d\n",a,b,a-b); break;case '*': printf("%d*%d=%d\n",a,b,a*b); break;case '/': printf("%d/%d=%d\n",a,b,a/b); break;}return 0;}