insertsubstring.c

#include <stdio.h>
#include <string.h>
#include <stdlib.h>
void insert_substring(char*, char*, int);
char* substring(char*, int, int);

int main()
{
   char text[100], substring[100];
   int position;
   
   printf("Enter some text\n");
   gets(text);
   
   printf("Enter a string to insert\n");
   gets(substring);
   
   printf("Enter the position to insert\n");
   scanf("%d", &position);
   
   insert_substring(text, substring, position);
   
   printf("%s\n",text);
   
   return 0;
}

void insert_substring(char *a, char *b, int position)
{
   char *f, *e;
   int length;
   
   length = strlen(a);
   
   f = substring(a, 1, position - 1 );      
   e = substring(a, position, length-position+1);

   strcpy(a, "");
   strcat(a, f);
   free(f);
   strcat(a, b);
   strcat(a, e);
   free(e);
}

char *substring(char *string, int position, int length)
{
   char *pointer;
   int c;
 
   pointer = malloc(length+1);
   
   if( pointer == NULL )
       exit(EXIT_FAILURE);
 
   for( c = 0 ; c < length ; c++ )
      *(pointer+c) = *((string+position-1)+c);      
       
   *(pointer+c) = '\0';
 
   return pointer;
}







/*
👋 Hi, I’m @aarushinair - Aarushi Nair (she/her/ella)
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*/