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Standard header files in C
In C language, header files contain the set of predefined standard library functions. The "#include" preprocessing directive is used to include the header files with ".h" extension in the program.
Here is the table that displays some of the header files in C language,
| Sr.No. | Header Files & Description |
|---|---|
| 1 | stdio.h Input/Output functions |
| 2 | conio.h Console Input/Output functions |
| 3 | stdlib.h General utility functions |
| 4 | math.h Mathematics functions |
| 5 | string.h String functions |
| 6 | ctype.h Character handling functions |
| 7 | time.h Date and time functions |
| 8 | float.h Limits of float types |
| 9 | limits.h Size of basic types |
| 10 | wctype.h Functions to determine the type contained in wide character data. |
Here is an example of header files in C language,
Example
#include <stdio.h>
#include<stdlib.h>
#include<string.h>
#include<math.h>
int main() {
char s1[20] = "53875";
char s2[10] = "Hello";
char s3[10] = "World";
int res;
res = pow(8, 4);
printf("Using math.h, The value is : %d\n", res);
long int a = atol(s1);
printf("Using stdlib.h, the string to long int : %d\n", a);
strcpy(s2, s3);
printf("Using string.h, the strings s2 and s3 : %s\t%s\n", s2, s3 );
return 0;
}
Output
Here is the output −
Using math.h, The value is : 4096 Using stdlib.h, the string to long int : 53875 Using string.h, the strings s2 and s3 : World World
Updated on: 04-Oct-2023
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