string position Archives - C Program Examples

K and R C, Solution to Exercise 4-1:
K and R C Programs Exercises provides the solution to all the exercises in the C Programming Language (2nd Edition). You can learn and solve K&R C Programs Exercise.
Write a C program which returns the position of the occurrence of sub string t in string s, or -1 if there is none.

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#include<stdio.h>
#include<conio.h>
void main()
{
 int flag=0;
 char str[80],search[10];
 puts("Enter a string:");
 gets(str);

 puts("Enter search substring:");
 gets(search);
 flag=strindex(str, search);
 if (flag == -1)
 {
  printf("SEARCH UNSUCCESSFUL! AND POSITION IS:%d",flag);
 }
 else{
  printf("SEARCH SUCCESSFUL! AND POSITION IS:%d",flag); 
 }
 getch();
}

//strindex: returns the right most index of t in s, -1 if none*/
int strindex(char s[], char t[])
{
 int k,i,j,pos;
 pos = -1;
 for(i=0;s[i] != ''; i++)
 {
  for(j=i, k = 0; t[k] != '' && s[j] == t[k]; j++, k++)
   ;
  if (k > 0 && t[k] == '')
   pos=i;
 } 
 return pos;
}

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/***********************************************************
* You can use all the programs on www.c-program-example.com
* for personal and learning purposes. For permissions to use the
* programs for commercial purposes,
* contact [email protected]
* To find more C programs, do visit www.c-program-example.com
* and browse!
*
* Happy Coding
***********************************************************/

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

void main()
{
char a[10];
char b[10];
char c[10];
int p=0,r=0,i=0;
int t=0;
int x,g,s,n,o;
clrscr();

puts("Enter First String:");
gets(a);
puts("Enter Second String:");
gets(b);
printf("Enter the position where the item has to be inserted: ");
scanf("%d",&p);
r = strlen(a);
n = strlen(b);
i=0;

// Copying the input string into another array
while(i <= r)
{
c[i]=a[i];
i++;
}
s = n+r;
o = p+n;

// Adding the sub-string
for(i=p;i<s;i++)
{
x = c[i];
if(t<n)
{
a[i] = b[t];
t=t+1;
}
a[o]=x;
o=o+1;
}

printf("%s", a);
getch();
}

C Program Examples

string position

K & R C Programs Exercise 4-1.

C program to insert a sub-string in to given main string from a given position.