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Here is an implementation of a simple algorithm that can be used to convert any number in decimal format to a number to any other base ‘b’.

The base ‘b’ can be octal, binary or even any other arbitrary base like 7.

#include<stdio.h> void convert10tob(int N,int b) { if (N==0) return; int x = N%b; N/=b; if (x<0) N+=1; convert10tob(N,b); printf("%d",x<0?x+(b*-1):x); return; } int main() { int N,b; while(scanf("%d%d",&N,&b)==2) { if (N!=0) { convert10tob(N,b); printf("\n"); } else printf("0\n"); } }