加减乘除计算器 int main() { //计算器 char sign = 0; float a, b, c; scanf("%f %c %f", &a, &sign, &b); switch (sign) { case '+': c = a + b; break; case '-': c = a - b; break; case '*': c = a*b; break; case '/': c = a / b; break; default: printf("输入错误!"); } printf("%.2f", c); return 0; }