please help with c program about queues

Hi everyone,

I am working on the piece of code below. It is supposed to allow the
user to insert 10 first names into a queue, then allow the user to
delete a name, and print the queue. I was able to compile the code,
run the program and enter the 10 first names in the queue. But then
the program "crashes": the program prints "error" infinitely many
times. I would appreciate if someone could help me identify the
problems.

Thanks a lot in advance for your help.

#include <stdio.h>
#define MAXNUM 10
#define MAXS 8

void insertq(void);
void deleteq(void);
void insertq(void);
void printq(void);

char q[MAXNUM][MAXS];
int h, t;
void main(void)
{
        char response[MAXS];
        h=-1;
        t=-1;
        printf("i/d/p/q");
        scanf("%s", response);
        while (response[0] != 'q' && response[0] != 'Q')
                switch(response[0]){
                        case 'i':
                                insertq();
                                break;
                        case 'd':
                                deleteq();
                                break;
                        case 'p':
                                printq();
                                break;
                        default:
                                printf("error input i/p/d/q");
                                break;
                }
        printf("i/p/d/q");
        scanf("%s", response);

}

void insertq(void)
{
        char response[MAXS];
        if (t-h+1 == MAXNUM)
                printf("overflow \n");
        else{
                printf("enter name");
                scanf("%s", response);
                if(h==-1){
                        h=0;
                        t=-1;
                }
        }

}

void printq(void)
{
        char response[MAXS];
        int j;
        printf("l or p");
        scanf("%s", response);

        if(response[0]=='l')
                for (j=h; j<=t; j++)
                                printf("%d %s \n", j, q[j]);
        if (response[0]=='p')
                for (j=h; j<=MAXNUM; j++)
                                printf("%d %s \n", j, q[j]);

}

void deleteq(void)
{
                if(h==-1)
                        printf("underflow \n");
                else
                        printf("servicing %s \n", q[h++]);
                if(h>t){
                        h=-1;
                        t=-1;
                } }