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C atoi() function:
- 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 C atoi() function:
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#include <stdio.h> #include <stdlib.h> int main() { char a[10] = "100"; int value = atoi(a); printf("Value = %d\n", value); return 0; } |
Output:
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Value = 100
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Other inbuilt typecast functions in C programming 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.
| Typecast function | Description |
| atof() | Converts string to float |
| atoi() | Converts string to int |
| atol() | Converts string to long |
| itoa() | Converts int to string |
| ltoa() | Converts long to string |