prompt user for input and display character in every line

hi im having problems printing "->" on the beginning of each line, im trying to do it as a loop and ending it when the user types "q". also i would like to know how to ignore text from the user when the input begings with a specific character. heres what ive done so far, and not currrently working as expected.

Code:

---

#include <stdio.h>
int main (void)
{
char prompt;
printf("~~~ FRACTION CALCULATOR ~~~\n");
printf(">");
prompt; getchar();
while (prompt !='q')
{
printf(">");
}
return 0;

---

Consider something like

Code:

---


char *doPrompt ( const char *prompt, char *buff, size_t buffsize ) {
    printf("%s",prompt);
    fflush(stdout);
    return fgets( buff, buffsize, stdin );
}

int main ( ) {
    char buff[BUFSIZ];
    while ( doPrompt("> ", buff, BUFSIZ ) ) {
        printf("Response=%s", buff);
    }
    return 0;
}

---