C Strings:
C Program to find the position of a sub string in a given string.
In this program, We find the position of a sub string where it starts  in the main string. Read more about C Programming Language .

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#include <stdio.h>
#include <conio.h>
main()
  {
    char firststr[30], substr[10];
    char *secondstr, *thirdstr;
    clrscr();
    printf("Enter any string");
    scanf("%s",firststr); 
    printf("Enter sub string");
    scanf("%s",substr); 
    secondstr=firststr;
    thirdstr=substr;
    i=substr(secondstr, thirdstr);
    printf("nn");
    if(i!=-1)
      printf("The starting location/position of substring in main string: %d", i;
    else
       printf("String not found");
       getch();
   } 
  

  int substr(secondstr, thirdstr)
    
{
  char *secondstr, *thirdstr;

  int j=0,l=0;
  static int k;
    if(*second==*third)
      {
        while(i<strlen(third))
         {
           if(*second==*third)
           k=j+1;
           else
             k+=1;
             l++;
          }
  third++;
  second++;
   }
 second++;
 j++;

if(k!=0)
  return(k);
else
return(-1);
} 

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