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A、(x-y)10 B、 fabs(x-y)-10 && x-y<10 D、(x-y)*(x-y)<100 喵查答案：(x-y)10
#include int main() { float data1, data2; char op; printf("Please enter the expression:"); scanf("%f %c%f", &data1, &op, &data2); /* %c前有一个空格 */ switch (op) { case '+': printf("%f + %f = %f\n", data1, data2, data1 + data2); break; case '-': printf("%f - %f = %f\n", data1, data2, data1 - data2); break; case '*': printf("%f * %f = %f\n", data1, data2, data1 * data2); break; case '/': printf("%f/%f = %f\n", data1, data2,data1/data2); break; default: printf("Invalid operator!\n"); } return 0; }