Binary to decimal in c

Question

I have a simple code to convert binary to decimal numbers. In my compiler, the decomposition works just fine for number less than 1000, beyond the output is always the same

Answer 1

#include   //printf
#include  //strlen
#include  //uintX_t or use int instead - depend on platform.

/* reverse string */
char *strrev(char *str){
    int end = strlen(str)-1;
    int start = 0;

    while( start