Predefined String Library Functions

Following are the functions defined in the file string.h

char strcat(char dest, char *src)

Appends the string pointed to, by src to the end of the string pointed to by dest.

char strncat(char dest, char *src, int n)

Appends the string pointed to, by src to the end of the string pointed to, by dest up to n characters long.

char strchr(char str, char c)

Searches for the first occurrence of the character c in the string pointed to, by the argument str.

int strcmp(char str1, char str2)

Compares the string pointed to, by str1 to the string pointed to by str2.

int strncmp(char str1, char str2, int n)

Compares at most the first n bytes of str1 and str2.

char strlwr(char str)

Converts a string pointed to by str to lowercase.

char strcpy(char dest, char *src)

Copies the string pointed to, by src to dest.

char strncpy(char dest, char *src, int n)

Copies up to n characters from the string pointed to, by src to dest.

int strlen(char *str)

Computes the length of the string str up to but not including the terminating null character.

char strrchr(char str, int c)

Searches for the last occurrence of the character c in the string pointed to by the argument str.

char strstr(char str1, char *str2)

Finds the first occurrence of the entire string str2 which appears in the string str1.

char strupr(char str)

Converts a string pointed to by str to uppercase.

char strrev(char str)

Reverses a string pointed to by str and returns reversed string.

int strcmpi(char str1, char str2)

Compares the string pointed to, by str1 to the string pointed to by str2 by ignoring case.

char * strset(char *str, char ch)

Sets all characters in pointed to by str to the value of ch.

char * strnset(char *str, char ch, int n)

Sets the first n characters in pointed to by str to the value of ch.

char * strtok(char str1, char str2)

searches str1 for tokens that are separated by delimiters specified in str2. Returns the pointers to the first character of first token in str1.

Program using string standard library functions

#include<stdio.h>

#include<string.h>

main()

{

char s1[20],s2[20];

int choice;

{

printf(“\n1: LENGTH OF STRING”);

printf(“\n2: COPY STRING”);

printf(“\n3: CONVERT TO UPPERCASE”);

printf(“\n4: STRING CONCATENATION”);

printf(“\n5: STRING COMPARE”);

printf(“\n6: EXIT”);

printf(“\n enter your choice”);

scanf(“%d”,&choice);

switch(choice)

{

case 1:

printf(“\n enter the string:”);

gets(s1);

printf(“\n The length is %d”,strlen(s1));

break;

case 2:

printf”(“\n Enter the string”);

gets(s1);

printf(“\n The copied string is %s”, strcpy(s2,s1));

break;

case 3:

printf(“\n Enter the string”);

gets(s1);

printf(“\n The uppercase string is %s”,strupr(s1));

break;

case 4:

printf(“\n Enter the first string:”);

gets(s1);

printf(“\n Enter the second string:”);

gets(s2);

strcat(s1,s2);

printf(“\n The concatenated string is %s”,s1);

break;

case 5:

printf(“\n Enter the first string:”);

gets(s1);printf(“\n Enter the second string:”);

gets(s2);

if (strcmp(s1,s2)==0)

printf(“\n string are equal”);

else

if(strcmp(s1,s2)>0)

printf(“s1 is greater than s2”);

else

printf(“s2 is greater than s1”);

}

}while(choice!=6);

}

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