I am implementing a Stack data structure using an array. To perform an operation on a stack like Push or Pop or Exit from Program, I am taking an input from a user in the form of an integer(Say 1 for Push).
For taking an input from a user continuously, I am running a while(1) loop and inside a loop asking a user to give an integer as an input for required operation.
Problem: during the execution, the program is not waiting for a user to give input and goes into infinite loop. I have tried to clear stdin using fflush but still not working.
Please look at the code below with given comments and help.
Thanks.
//Main function
int main(){
STACK marks, roll_number; //marks and roll_number are two stacks of type STACK
//Initialize both Stacks with required size
initStack(&marks, 10);
initStack(&roll_number, 10);
int choice, marks_data;
//Menu for user to choose from available operations
printf("1. Push\n");
printf("2. Pop\n");
printf("3. Exit\n");
//Taking user input for operations
while(1){
printf("Enter choice of Operation:\n");
//Clearing standard input. Although not a best practice but implementing to
//take user input
fflush(stdin);
// program is not stopping here and taking invalid choice
//hence executing 'default statement' of switch case
scanf("%d", &choice);
switch(choice){
case 1: printf("Enter Marks");
scanf(" %d", &marks_data);
push(&marks, marks_data);
break;
case 2: marks_data = pop(&marks);
printf("Deleted Data : %d\n", marks_data);
break;
case 3: exit(0);
default: printf("Invalid Choice of Operation !!\n");
}
//using to clear \n character from user and taking valid input
printf("Press Enter Key to continue...");
while(getchar() != '\n')
getchar();
}
return 0;
}
