C program to replace the sub string with another string.

C Strings:
Write a C program to replace the sub string in a string with another string.
In this program, We replace string with another string, if the entered string is the sub string of main string, otherwise function replace_str returns the original string as it is. Read more about C Programming Language .

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

char *replace_str(char *str, char *orig, char *rep)
{
static char buffer[4096];
char *p;

if(!(p = strstr(str, orig)))
return str;

strncpy(buffer, str, p-str);
buffer[p-str] = '';

sprintf(buffer+(p-str), "%s%s", rep, p+strlen(orig));

return buffer;
}

int main(void)
{
char str[100],str1[50],str2[50];
printf("Enter a one line string..n");
gets(str);
printf("Enter the sub string to be replaced..n");
gets(str1);
printf("Enter the replacing string....n");
gets(str2);
puts(replace_str(str, str1, str2));

return 0;
}
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C Program to demonstrate the strstr function.

C Program to demonstrate the strstr function.
strstr function finds the substring in a string. strstr() returns pointer of the first occurrence of the string other wise it returns the null pointer is returned.
In this program strstr returns a pointer into ‘string’ if ‘test’ is found, if not found, NULL is returned. Read more about C Programming Language .

/***********************************************************
* 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 info@c-program-example.com
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*
* Happy Coding
***********************************************************/


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

main()
{
char string[]="string to search";
char test[]="sear";
if (strstr(string, test)) puts("String found");

}
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C Program to count the number of occurrences of particular word in a string

C Program that counts the particular word in the given string. For example in the string ” the string is the set of charterers” , Number of occurrences of “the” is:2. Read more about C Programming Language .

/***********************************************************
* 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 info@c-program-example.com
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* and browse!
* 
*                      Happy Coding
***********************************************************/

#include<stdio.h>

#include<string.h>

main()

{

 int strln,wordln,i,j,k,flag,count=0;

 char str[200],word[20];

 printf("Enter line of text:n");

 gets(str);

 printf("Enter the word to count:n");

 scanf("%s",word);

 strln=strlen(str);

 wordln=strlen(word);

 for(i=0;i<strln;i++)

 {

  if(str[i]==word[0]&&((str[i-1]==' '||i==0)&&(str[i+wordln]==' '||str[i+wordln]=='')))

  {

   for(flag=0,k=i+1,j=1;j<wordln;j++,k++)

   {

    if(str[k]==word[j])

    {

     flag++;

    }

   }

   if(flag==wordln-1)

   {

    count++;

   }

  }

 }

 printf("Number of occurence of '%s' = %dn",word,count);

}

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

C Strings:
C Program to insert a sub-string in to given main string from a given position. In this program we read two strings and replace the second string in the given position of the first string.Read more about C Programming Language .

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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 info@c-program-example.com
* 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();
}
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C Program to accept a string and a substring and check if the substring is present in the given string

C Strings:
Write a C program to accept a string and a substring and check if the substring is present in the given string. Program search’s given substring is in the string or not, and prints the appropriate message. Read more about C Programming Language .

/***********************************************************
* 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 info@c-program-example.com
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* and browse!
*
* Happy Coding
***********************************************************/




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

void main()
{
char str[80],search[10];
int count1=0,count2=0,i,j,flag;


clrscr();

puts("Enter a string:");
gets(str);

puts("Enter search substring:");
gets(search);

while (str[count1]!='')
count1++;

while (search[count2]!='')
count2++;

for(i=0;i<=count1-count2;i++)
{
for(j=i;j<i+count2;j++)
{
flag=1;
if (str[j]!=search[j-i])
{
flag=0;
break;
}
}
if (flag==1)
break;
}
if (flag==1)
puts("SEARCH SUCCESSFUL!");
else
puts("SEARCH UNSUCCESSFUL!");
getch();
}
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