Hello there, Basically i got this for loop and i want the number inputed (eg. 123) to be printed out in reverse, so "321". so far it works fine and prints out the correct order when the for loop is

for(i = 0; i<len ; i++)

but i get an error when i try to print it in reverse?. Whats going wrong?

#include <stdio.h>
#include <string.h>
void cnvrter(char *number);

int main(){
    char number[80];
    printf("enter a number ");
    gets(number);
    cnvrter(number);

    return 0;
}

void cnvrter(char *number){
    char tmp[80];
    int i = 0,len = 0;
    int cnvrtd_digit = 0;
    len = strlen(number);
    printf("\nsize of input %d\n",len);
    for(i = len; i>len ; i--){
        if ( ( number[i] >= '0' ) && ( number[i]<='9' ) ){
            tmp[0] = number[i];
            sscanf(tmp,"%d",&cnvrtd_digit);

        }
        printf("%d\n",cnvrtd_digit);
    }

}