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Write a C program that displays the position or index of a substring in main string

asked Apr 20, 2020 in JNTU BTech (CSE-I-Sem) C PROGRAMMING AND DATA STRUCTURES LAB by Aditya Chodhary Goeduhub's Expert (7.1k points)

Write a C program that displays the position or index in the string S where the string T begins, or – 1 if S doesn‘t contain T.

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1 Answer

answered Apr 20, 2020 by Aditya Chodhary Goeduhub's Expert (7.1k points)
edited May 31, 2020 by Aditya Chodhary

Best answer

Sub string in Main String

In this program we are going to search for a sub string in the main string both provided by the user.

To learn string and it's function in C programming Click Here.

Example :

#include<stdio.h>
#include<string.h>
#include<conio.h>

void main()
{
char str[100],str1[30];
char *index;
clrscr();

//Entering the main string
printf("\nEnter the main first string: ");
gets(str);

//Entering the string whose position or index to be displayed
printf("\nEnter the string to be searched: ");
gets(str1);

//Searching string str1 in string str using strstr() function of C
index=strstr(str,str1);
if(index)
printf("Sub String is found in the Main String at %d position.\n",index-str+1);
else
printf("\nSub string not found");
getch();
}