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- atoi() function in C language converts string data type to int data type. Syntax for atoi() function is given below.
int atoi (const char * str);
- “stdlib.h” header file supports all the type casting functions in C language.
Example program for atoi() function in C:
#include <stdio.h>
#include <stdlib.h>
int main()
{
char a[10] = "100";
int value = atoi(a);
printf("Value = %dn", value);
return 0;
}
Output:
|
Value = 100
|
……
Other inbuilt typecasting functions in C language:
- Typecasting functions in C language performs data type conversion from one type to another.
- Click on each function name below for description and example programs.
| S.no | Typecast function | Description |
| 1 | atof() | Converts string to float |
| 2 | atoi() | Converts string to int |
| 3 | atol() | Converts string to long |
| 4 | itoa() | Converts int to string |
| 5 | ltoa() | Converts long to string |
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