Thread: problem with recurse pro

Code:

   I have some problem with a  small recurse program,debug is OK,but the running result is  incorrect.The function of the program is to calculate a total  addition result of the variable x, may be there are some problem with the semantic, can any friend  help me?Thanks very much!
    
                     #include<stdio.h>
                      int test(int sum)     
                     {int x;
                      scanf("%d",&x);
                      if(x==0) sum=0;
                      else{test(sum);sum+=x;}
                      return(sum);
                       }
               
                     int main()
                    {int t,s;
                     s=test(t);
                     printf("%d",s);
                    return 0;
                      }

Code:

well, I first make it like this:              
            #include<stdio.h>
                      int test(int sum)     
                     {int x;
                      scanf("%d",&x);
                      if(x==0) sum=0;
                      else{test(sum);sum+=x;}
                      printf("%d",sum);
                       }
               
                     int main()
                    {int t;
                     test(t);
                     return 0;
                      }
 
the running result is totally wrong.

Code:

        OK,I have make it.Change one sentence.And here it is:
         
          #include<stdio.h>
           int test(int sum)
           {int x;
           scanf("%d",&x);
             if(x==0) sum=0;
             else{sum=test(sum)+x;}
            return(sum);
             }

             int main()
            {int t,s;
             s=test(t);
             printf("%d",s);
             return 0;
              }