In this article, we will write a C program to use a function to insert a sub-string in to given main string from a given position.

Algorithm: 

Step 1: start 

Step 2: read a main string and substring 

Step 3: find the length of the main string(r) 

Step 4: find the length of substring(n) 

Step 5: copy the main string into substring 

Step 6: read the position to insert the substring( p) 

Step 7: copy substring into the main string from position p-1 

Step 8: copy the temporary string into the main string from position p+n-1 

Step 9: print the strings 

Step 10: stop 

Write a C program to use a function to insert a sub-string in to given main string from a given position

#include <stdio.h> #include <string.h> main() {	char a[3 qq0], b[30], c[30];	int pos = 0, i = 0, l, la, lb, lc, j;	puts("Enter a string");	gets(a);	puts("Enter sub string");	gets(b);	puts("enter position for insertion");	scanf("%d", &pos);	la = strlen(a);	lb = strlen(b);	l = pos + lb;	lc = la + lb;	for (i = 0; i < pos; i++)	{	c[i] = a[i];	}	j = 0;	for (i = pos; i <= l; i++)	{	c[i] = b[j];	j++;	}	j = pos;	for (i = l; i < lc; i++)	{	c[i] = a[j];	j++;	}	c[i] = '\0';	puts("String after Insertion is:");	printf("%s", c); }

Input:

Enter First String: Comer Enter Second String: put 

Output:

Enter the position where the item has to be inserted:3 Computer 

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