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strstr()
strstr( ) function returns pointer to the first occurrence of the string in a given string. Syntax for strstr( ) function is given below.
char *strstr(const char *s1, const char *s2)s1 — This is the main C string to be scanned.
s2 — This is the small string to be searched with-in haystack string.
Program: To find substring in a string
#include <stdio.h>
#include<string.h>
int main()
{
char s1[100];
char s2[100];
char *ptr;
puts("Enter string1");
gets(s1);
puts("Enter string2");
gets(s2);
ptr = strstr(s1,s2);
if(ptr == NULL)
{
puts("string not present");
}
else
{
printf("string present at %s",ptr);
}
return 0;
}Output
Enter string1
Knowlege is power
Enter string2
pow
string present at powerProgram: String Palindrome
#include<stdio.h>
#include<string.h>
int main()
{
char s[100];
char r[100];
int i=0,j=0;
puts("Enter string");
gets(s);
/* compute string length */
while(s[i] != '\0')
{
i++;
}
/* copy one string to another */
while(i>0)
{
i--;
r[j] = s[i];
j++;
}
r[j] = '\0'
/*compare reverse with original string */
if(strcmp(r,s) == 0)
{
printf("%s is palindrome");
}
else
{
printf("%s is not palindrome");
}
return 0;
}Output
Enter string
mam is palindromeViews: 0