Scanf pit of doom

[Derek Lake]

Hi, I have included ample explanatory comments in my code, so I think it will be most efficient just to post it to you:

#include "Queue.h"

int main(void)
{
    QueueT Queu;
    QueueT *pQS;
    pQS = &Queu;
    initQueue(pQS);
    char insChr;
    int menuSelection = 0;
    int *ptrMS = &menuSelection;
//main menu
    printf("\n\nProgram has been initialized.\n");
    printf("Size:%d\nHead:%d\nTail:%d\n",pQS->size,pQS->head,pQS->tail);
while (menuSelection != 7)
{
    printf("\n\nMenu:\n1:insertQueue\n2:removeQueue\n3:peekQueue\n4:isEmptyQueue\n");
    printf("5:isFullQueue\n6:displayQueue\n7:Exit program\n");
    printf("Please enter your selection followed by the enter key.\n");

    scanf("%d",&menuSelection);
    //ATTN: coding help section comment
    //There is a DEATH PIT for scanf character statements here. I simply cannot get any to
    //function here or anywhere beyond here in this while statement.
    //Let me be clear that any reasonable place before the above 
    //scanf("%d",&menuSelection); statement is working fantastic but the minute I
    //go past this line, it no longer works.

    switch(menuSelection)
    {
        case 1:
//ATTN: coding help section comment
//The below two statements don't work at all. In the program, it just skips this completely.
            printf("Please enter the character to be added to the queue:\n");
            scanf("%c",&insChr);
            //debugging printf below to test for performance;fails, also skipped in output.
            printf("%c",insChr);
            
            insertQueue(pQS,insChr);
            //If I try to go ahead and do these operations in the inserQueue function
            //instead, it continues to fail miserably.
            //I can declare the variables inside of the function, but
            //any time I try to access any part of "insChr", the operation immediately
            //resumes failing.
            //I would declare them inside of the function and say crisis
            //averted but this is for a project.
            break;
        case 3:
             printf("The next item in the queue is:\n");
                 peekQueue(pQS);
             break;
        case 4:
             printf("1 indicates empty, 0 indicates that the queue is not empty\n%d\n",isEmptyQueue(pQS));
             break;
        case 5:
             printf("1 indicates full, 0 indicates the queue is not full\n%d\n",isFullQueue(pQS));
             break;
        case 6:
             printf("The queue contains the following items:\n");
                 displayQueue(pQS);
            break;

    }
                system("Pause");
}
    
    //Tests the size, head and tail to make sure Circular Buffer was initialized
    //properly.

    

    return 0;
}

[Salem]

> scanf("%d",&menuSelection);
Will leave a \n

> scanf("%c",&insChr);
Always takes the next character. %c does NOT do the normal skip leading whitespace that all the other conversion formats do.

If you want to read the next non-whitespace character, then try
scanf(" %c",&insChr); // note the initial space

[Derek Lake]

Thank you for your time Salem! This worked.