- The C Standard Library
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- A C identifier is a name used to identify a variable, function, or any other user-defined item. An identifier starts with a letter A to Z, a to z, or an underscore ' followed by zero or more letters, underscores, and digits (0 to 9).
- For the purposes of these tables, a, b, and c represent valid values (literals, values from variables, or return value), object names, or lvalues, as appropriate.R, S and T stand for any type(s), and K for a class type or enumerated type. Arithmetic operators. All arithmetic operators exists in C and C and can be overloaded in C.
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Description
The C library function int atoi(const char *str) converts the string argument str to an integer (type int).
Declaration
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Following is the declaration for atoi() function.
Parameters

str − This is the string representation of an integral number.
Return Value
This function returns the converted integral number as an int value. If no valid conversion could be performed, it returns zero.
Example
The following example shows the usage of atoi() function.
Let us compile and run the above program that will produce the following result −

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An if statement consists of a Boolean expression followed by one or more statements.
Syntax
The syntax of an 'if' statement in C programming language is −
If the Boolean expression evaluates to true, then the block of code inside the 'if' statement will be executed. If the Boolean expression evaluates to false, then the first set of code after the end of the 'if' statement (after the closing curly brace) will be executed.
C programming language assumes any non-zero and non-null values as true and if it is either zero or null, then it is assumed as false value.
Flow Diagram
Example
When the above code is compiled and executed, it produces the following result −
