![Strlen()
This function is used to calculate length of string.
#include<stdio.h>
#include<string.h>
int main()
{
char a[20]=“India”;
printf(“Length of string=%d”, strlen(a));
return 0;
}
0 1 2 3 4 5 6 7
I n d i a 0
Output:
Length of string=5](https://image.slidesharecdn.com/stringsincprogramming-200422100456/85/String-predefined-functions-in-C-programming-3-320.jpg)
![Strrev()
This function is used to reverse the given string .
#include<stdio.h>
#include<string.h>
int main()
{
char a[20]=“India”;
Printf(“string before reversing=%s”,a);
printf(“Reverse of given string=%s”, strrev(a));
return 0;
}
0 1 2 3 4 5 6 7
I n d i a 0
0 1 2 3 4 5 6 7
a i d n i 0
Output:
String before reversing=India
Reverse of given string=aidni](https://image.slidesharecdn.com/stringsincprogramming-200422100456/85/String-predefined-functions-in-C-programming-4-320.jpg)
![Strcat()
This function is used to concatenates two given strings.
It concatenates source string at the end of target string.
#include<stdio.h>
#include<string.h>
int main()
{
char a[20]=“Hello”, b[20]=“Pune”;
printf(“string first before concatenate=%s”,a);
strcat(a,b);
printf(“String after concatenation=%s”, a);
return 0;
}
0 1 2 3 4 5 6
H e l l o 0
0 1 2 3 4 5 6 7
P u n e 0
Output:
String first before concatenate =Hello
String after Concatenation=HelloPune
0 1 2 3 4 5 6 7 8 9 10
H e l l o P u n e 0](https://image.slidesharecdn.com/stringsincprogramming-200422100456/85/String-predefined-functions-in-C-programming-5-320.jpg)
![Strcpy()
This function is used to copy one string into other
character array .
#include<stdio.h>
#include<string.h>
int main()
{
char a[20]=“India”, b[20];
strcpy(b,a);
printf(“Contents of string second=%s”, b);
return 0;
}
0 1 2 3 4 5 6 7
I n d i a 0
0 1 2 3 4 5 6 7
I n d i a 0
Output:
Contents of string second=India
0 1 2 3 4 5 6 7](https://image.slidesharecdn.com/stringsincprogramming-200422100456/85/String-predefined-functions-in-C-programming-6-320.jpg)
![Strcmp()
This function is used to compare two strings.
0=> If strings are same
+ve=>ASCII of first character is greater
-ve=> ASCII of first unmatched character is less
#include<stdio.h>
#include<string.h>
int main()
{
char a[20]=“ANT”, b[20]=“BALL”;
char c[10]=“ANT”;
int result;
result=strcmp(a,b);
printf(“strcmp(a,b)=%dn”, result);
result=strcmp(b,c);
printf(“strcmp(b,c)=%dn”, result);
return 0;
}
0 1 2 3 4 5 6 7
A N T 0
Output:
Strcmp(a,b)=-1
Strcmp(b,c)=0
0 1 2 3 4 5 6 7
B A L L 0
0 1 2 3 4 5 6 7
A N T 0](https://image.slidesharecdn.com/stringsincprogramming-200422100456/85/String-predefined-functions-in-C-programming-7-320.jpg)
String predefined functions in C programming
- 1. Strings in C Programming By Asst. Prof. Sonali Gholve String predefined functions Strlen() Strrev() Strcat()Strcpy() Strcmp()
- 2. Predefined string functions • C Programming language provides a set of predefined string functions called string handling functions to work with string values. • <string.h> – strlen() – strrev() – strcat() – strcpy() – strcmp()
- 3. Strlen() This function is used to calculate length of string. #include<stdio.h> #include<string.h> int main() { char a[20]=“India”; printf(“Length of string=%d”, strlen(a)); return 0; } 0 1 2 3 4 5 6 7 I n d i a 0 Output: Length of string=5
- 4. Strrev() This function is used to reverse the given string . #include<stdio.h> #include<string.h> int main() { char a[20]=“India”; Printf(“string before reversing=%s”,a); printf(“Reverse of given string=%s”, strrev(a)); return 0; } 0 1 2 3 4 5 6 7 I n d i a 0 0 1 2 3 4 5 6 7 a i d n i 0 Output: String before reversing=India Reverse of given string=aidni
- 5. Strcat() This function is used to concatenates two given strings. It concatenates source string at the end of target string. #include<stdio.h> #include<string.h> int main() { char a[20]=“Hello”, b[20]=“Pune”; printf(“string first before concatenate=%s”,a); strcat(a,b); printf(“String after concatenation=%s”, a); return 0; } 0 1 2 3 4 5 6 H e l l o 0 0 1 2 3 4 5 6 7 P u n e 0 Output: String first before concatenate =Hello String after Concatenation=HelloPune 0 1 2 3 4 5 6 7 8 9 10 H e l l o P u n e 0
- 6. Strcpy() This function is used to copy one string into other character array . #include<stdio.h> #include<string.h> int main() { char a[20]=“India”, b[20]; strcpy(b,a); printf(“Contents of string second=%s”, b); return 0; } 0 1 2 3 4 5 6 7 I n d i a 0 0 1 2 3 4 5 6 7 I n d i a 0 Output: Contents of string second=India 0 1 2 3 4 5 6 7
- 7. Strcmp() This function is used to compare two strings. 0=> If strings are same +ve=>ASCII of first character is greater -ve=> ASCII of first unmatched character is less #include<stdio.h> #include<string.h> int main() { char a[20]=“ANT”, b[20]=“BALL”; char c[10]=“ANT”; int result; result=strcmp(a,b); printf(“strcmp(a,b)=%dn”, result); result=strcmp(b,c); printf(“strcmp(b,c)=%dn”, result); return 0; } 0 1 2 3 4 5 6 7 A N T 0 Output: Strcmp(a,b)=-1 Strcmp(b,c)=0 0 1 2 3 4 5 6 7 B A L L 0 0 1 2 3 4 5 6 7 A N T 0