c - Variable isn't storing return value -

i trying make program converts hex string decimal. having issue assigning returned integer value findlength function. going printf statements can tell findlength(thestring) yield correct value length showing value of 0 despite fact have length = findlength(thestring).

this isn't homework problem, i'm absolutely stumped why simple assignment isn't working. i've declared length know that's not issue. i'm getting no compiler messages. appreciated.
edit: know convert doesn't useful , loop needs fixed shouldn't effecting findlength return right? second edit: i've submitted string of '324' tested.

#include <stdio.h>  int convert(char s[], int thelength); int findlength(char s[]);  int main(){     char thestring[100];     int result;     int i;     int length;       printf("%s","hello, please enter string below.  press enter when finished.");       scanf("%s",thestring);      //apparently scanf bad we'll learn better input methods later.                                //for tests submitted string of '324'.        length = (findlength(thestring));     //length = findlength('324')     printf("%d",findlength(thestring));   //yields 3     printf("%d",length);                  //yields value of 0 always.      result  = convert(thestring, length);     printf("%d\n result is",result);      return 0;  }               //end of main  int convert(char s[], int thelength){       //this function converts string of hex ints.  of nothing useful.     int i;     int sum;       for(i = thelength; i=0; i--){         sum = sum + s[i];         printf("%d\n",sum);     }      return sum; }               //end of convert    int findlength(char s[]){     int i;     for(i = 0; s[i]!='\0'; ++i){     }      return(i);  }               //end of findlength 

the variable length storing correct value. think has confused how you've laid out printf statements. if try below easier see code works.

#include <stdio.h>  int findlength(char s[]);  int main(){     char thestring[100];     int result;     int i;     int length;      printf("hello, please enter string below. press enter when finished.\n");      scanf("%s",thestring);      length = (findlength(thestring));     printf("findlength(thestring) = %d\n",findlength(thestring));     printf("length = %d\n",length);      return 0; }  int findlength(char s[]){     int i;     for(i = 0; s[i]!='\0'; ++i){     }     return(i); } 

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just clarify in post have

printf("%d",findlength(thestring)); printf("%d",length);  printf("%d\n result is",result); 

note \n before %d in last printf statement. 0 because convert function needs fixed , value of result not length.