c语言除号怎么打,C语言学习种除号问题出现奇怪错误

#include

int main() {

int first;

int second;

char operator;

scanf("%d%c%d", &first,&operator, &second);

if (operator=='+') {

printf("=%d",first+second);

}else if (operator=='-'){

printf("=%d",first-second);

}else if (operator=='//'){

printf("=%d",first/second);

}else if (operator=='*'){

printf("=%d",first*second);

}else {

printf("=%d",first%second);

}

return 0;

}

除法运行结果不正确。其他4种运行结果对。

#include

int main() {

int first;

int second;

char operator;

scanf("%d%c%d", &first,&operator, &second);

if (operator=='+') {

printf("=%d",first+second);

}else if (operator=='-'){

printf("=%d",first-second);

}else if (operator=='/'){

printf("=%d",first/second);

}else if (operator=='*'){

printf("=%d",first*second);

}else {

printf("=%d",first%second);

}

return 0;

}

运行5种运算结果都正常,但是说我除号那里有错,加了转义符的运行结果就不正确,编译都不报错。