base conversion

/*this program converts number in any base to any other base (limit>> only upto hex number, ie, base 16)*/


#include<stdio.h>
#include<conio.h>
#include<stdlib.h>


int entry();// gets any base input and converts it to decimal

int main(void)
{

int ip_num,ip_base,op_num,op_base,i=0,cont_flag,acc[20];

char base_digits[16] = {'0','1','2','3','4','5','6','7','8','9','A','B','C','D','E','F'};

do
{
ip_num=entry();

printf("choose the base to convert to:");
scanf("%d",& op_base);


puts("\nin main()\n\nexecuting for() loop . . .\n\n");
for(i=0;i<20 && ip_num!=0;i++) // converts to i/p to required o/p base
{

acc[i]=(ip_num % op_base);
ip_num=ip_num/op_base;
printf("index: %d \n",i);

if(ip_num==0)
break;

if(i==19) {
puts("array acc[] full");
break;
}

}//end of for()

printf("\nconverted number in base %d is:",op_base);

for(i;i>=0;i--)// prints the number to screen
{
printf("%c",base_digits[acc[i]]);
}

printf("\n\nconvert another number? press\n 1(yes)\n 0(no)\n:");
scanf("%d",& cont_flag);
}while(cont_flag==1);// cont_flag lets user decide whether they want to convert another number or not
}


int entry()
{
 char sh[100],*stop;
 int ip_num,ip_base;
printf("Enter input number: ");
scanf("%s",&sh);

printf("enter input base: ");
scanf("%d",&ip_base);

 ip_num = strtol(sh,&stop,ip_base);
 return(ip_num);
}