C – atoi() function

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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:

COMPILE & RUN

Output:

Value = 100

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

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