string - C Program to get file name and range of numbers from user generate numbers from a specified range and print to file -

i writing program few things user , write results file. program file name, number of numbers generate, lowest , highest numbers generate, write file named user.

the program doing 2 things not correct:

1. it generating numbers outside user specified range

2. it adding ? end of file name, tried using strlen remove last character of string , error: incompatible implicit declaration of built-in function 'strlen'.

#include <stdio.h> #include <stdlib.h>  int main() {  char s[100];  file *fout;  int i, x, len;  int h, l, q, a;   printf("please enter file name: ");  fgets(s, sizeof(s), stdin);  printf("how many numbers should generate: ");  scanf("%d", &q);  printf("lowest number generate: ");  scanf("%d", &l);  printf("highest number generate: ");  scanf("%d", &h);   fout = fopen(s, "wb");   = h - l;   if ( fout == null)  {   printf("that file not available\n");   exit(1);  }   fprintf(fout, "%d\n", q);   (i=0; < q; ++i)   {   x = (rand() % l) + a;   fprintf(fout, "%d ", x);  }  fclose(fout); return 0; } 

• concerning file name: remove newline character '\n' (or '\x0a') @ end of s after fgets():

  if( s[strlen(s)-1] == '\n' )      s[strlen(s)-1] = '\0'; 

  for completeness: on windows had remove carriage return + newline '\r'+'\n' (or '\x0d'+'\x0a')

• concerning wrong numbers: should x = (rand() % a) + l; (modulus range + lowest, not other way round)