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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; 
do 
{ 
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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