如何解决如何检查用户在我的字符中输入的多个字符?
do{
char reply;
printf("Enter your choice > ")
scanf("%c",&reply)
if (isdigit(reply) != 0){
//inside are my contents not really important
//what I want to ask is,if user input 123,because it is a char,hence 1 will be taken but it is a wrong input. How can i check it and print a "invalid input"?
}
}while (reply != 3)
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