string programs in c in built functions

operations on string

sstr operations

#include<stdio.h>

#include<conio.h>

#include<string.h>

void main()

{

int i,b;

char str1[80],str2[80];

printf("Enter a string");

gets(str1);

printf("Enter another string");

gets(str2);

if(strstr(str1,str2)==NULL)

printf("Not Found");

else

printf("found");

getch();

}

conversion lower to upper

#include<stdio.h>

#include<conio.h>

#include<string.h>

void main()

{

char str[20];

int len;

printf("Enter first string\n");

gets(str);

len=strlen(str);

printf("Length of string is %d\n",len);

printf("Upper case transformation is : \n");

puts(strupr(str));

printf("Lower case transformation is : \n");

puts(strlwr(str));

printf("Reverse is : \n");

puts(strrev(str));

getch();

}

string copy

#include<stdio.h>

#include<conio.h>

#include<string.h>

void main()

{

char ori[20],dup[20];

int i ;

printf("Enter string");

gets(ori);

strcpy(dup,ori);

puts("Original string is ");

puts(ori);

puts("Duplicate string is ");

puts(dup);

getch();

}

  string comparison

#include<stdio.h>

#include<conio.h>

void main()

{

int i,b;

char str1[80],str2[80];

printf("Enter a string");

gets(str1);

printf("Enter another string");

gets(str2);

if(strcmp(str1,str2)==0)

   printf("Strings are equal");

else

   printf("Strings are not equal");

getch();

}