Division a/b

#include <stdio.h>

int main()
{
int a , b ;
char z ,tmp[10];
printf("Program checks divisibility a through b\n");
printf("Enter a pair of integer numbers");
do{
{
    printf("enter a =");
    scanf("%s",&tmp);
}
while(atoi(tmp)==0);
a = atoi(tmp);
do
{
    printf("enter b =");
    scanf("%s",&tmp);
}
while(atoi(tmp)==0);
b = atoi(tmp);
if((a%b) == 0) printf(" Number a = %d is divisible through b = %d",a,b);
else printf(" Number a = %d is not divisible through b = %d",a,b);
printf("\nContinoe? (n-finish)\n");
z = getchar();
}while((z!='n')&&(z!='N'));
    return 0;
}