c - The return value of function returning long long unsigned int is incorrect -

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when call function wordtoint(c) main, return value different it's printing inside function.

main() {     long long  unsigned item;     char c[6] = "abcde";     item = wordtoint(c);     printf("main  item :%llu\n",item); }  long long unsigned wordtoint(char *c) {     long long unsigned int k,item=0;     int i,len;     int j,p=0;     len = (int) strlen(c);      for(i = len-1;i>=0;i--)     {         if(c[i] == 'c')             j = 42;         else if(c[i] == '*')             j = 99;         else             j = (int) c[i];         j = j%100;         k = pow(100,p);         p++;         item = item + (j*k);     }      printf("function item :%llu\n",item);     return item; }

the output of program is:

function item :6566676869 main  item :18446744071686293893

can tell me why there inconsistency in output?

first -- pay attention compiler's warnings, matter!

answer -- since didn't prototype wordtoint() before using it, compiler warned had not been prototyped , assumed function returned int (which smaller long long)... got int value returned, rather long long. value printed within function correct because function knew proper type.


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