<stdlib.h>
stdlib.h is the header of the general purpose standard library of C programming language which includes functions involving memory allocation, process control, conversions and others. It is compatible with C++ and is known as cstdlib in C++. The name "stdlib" stands for "standard library".
• Member functions
• Members of the stdlib.h can be classified into the following categories: conversion, memory, process control, sort and search, mathematics.
Name Description
Type Conversion
atof string to double (NOT float)
atoi string to integer
atol string to long
strtod string to double
strtol string to long int
strtoul string to unsigned long int
strtoll string to long long int
strtoull string to unsigned long long int
Memory allocation and deallocation
malloc allocate memory from the heap free
realloc release memory back to the heap
abort terminate execution abnormally
atexit register a callback function for program exit
exit terminate program execution
getenv retrieve an environment variable
system execute an external command
bsearch binary search an array
qsort sort an array
stdlib.h is the header of the general purpose standard library of C programming language which includes functions involving memory allocation, process control, conversions and others. It is compatible with C++ and is known as cstdlib in C++. The name "stdlib" stands for "standard library".
• Member functions
• Members of the stdlib.h can be classified into the following categories: conversion, memory, process control, sort and search, mathematics.
Name Description
Type Conversion
atof string to double (NOT float)
atoi string to integer
atol string to long
strtod string to double
strtol string to long int
strtoul string to unsigned long int
strtoll string to long long int
strtoull string to unsigned long long int
Memory allocation and deallocation
malloc allocate memory from the heap free
realloc release memory back to the heap
abort terminate execution abnormally
atexit register a callback function for program exit
exit terminate program execution
getenv retrieve an environment variable
system execute an external command
bsearch binary search an array
qsort sort an array
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