C Cheat Sheet 3l5e31
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Computational Form Jared Schiffman Fall 2007
C/C++ Cheat Sheet (v1) libraries #include #include #include #include #include
<stdio.h> <string.h> <stdlib.h> <math.h>
input and output functions string related functions memory allocation, rand, and other functions math functions time related functions
functions returnType functionName( input1Type input1Name, input2Type input2Name, .... ) { // do something return value;
// value must be of type returnType
}
comments // one line comments
this is a C++ style one line comment
/* multiple line block comment */
this is a traditional C style comment
variable types char bool int float void
holds a character, or a number from -128 to 127 (1 byte) holds a boolean value, either true or false (1 byte) hold an integer (a positive or negative number with NO decimal, 4 bytes) holds a real number (a positive or negative number with a decimal, 4 bytes) no type, raw binary data
conditionals A A A A A A
== B != B B <= B >= B
if if if if if if
A A A A A A
is is is is is is
equal to B, this is true; otherwise, it’s false NOT equal to B, this is true; otherwise, it’s false less than B, this is true; otherwise, it’s false greater B, this is true; otherwise, it’s false less than or equal to B, this is true; otherwise, it’s false greater or equal to B, this is true; otherwise, it’s false
control flow if ( conditional ) { // do something }
if ( conditional ) { // do something } else { // do something else }
while ( conditional ) { // do something }
placing “break;” inside a while loop breaks out of the loop
for ( initialization; test; command ) { // do something }
“break;” and “continue;” can be used within for loops as well with identical effects
switch ( variable ) { case value1: // do something break; case value2: // do something else break; default: // do something by default break; }
this is equivalent to:
if ( conditional ) { // do something } else if ( another_conditional ) { // do something else } else { // do something as default }
placing “continue;” inside a while loop jumps to the start of the next loop
if ( variable == value1 ) { // do something } else if ( variable = value2 ) { // do something else } else { // do something by default }
this is equivalent to: initialization; while( test ) { // do something command; }
C/C++ Cheat Sheet (v1) libraries #include #include #include #include #include
<stdio.h> <string.h> <stdlib.h> <math.h>
input and output functions string related functions memory allocation, rand, and other functions math functions time related functions
functions returnType functionName( input1Type input1Name, input2Type input2Name, .... ) { // do something return value;
// value must be of type returnType
}
comments // one line comments
this is a C++ style one line comment
/* multiple line block comment */
this is a traditional C style comment
variable types char bool int float void
holds a character, or a number from -128 to 127 (1 byte) holds a boolean value, either true or false (1 byte) hold an integer (a positive or negative number with NO decimal, 4 bytes) holds a real number (a positive or negative number with a decimal, 4 bytes) no type, raw binary data
conditionals A A A A A A
== B != B B <= B >= B
if if if if if if
A A A A A A
is is is is is is
equal to B, this is true; otherwise, it’s false NOT equal to B, this is true; otherwise, it’s false less than B, this is true; otherwise, it’s false greater B, this is true; otherwise, it’s false less than or equal to B, this is true; otherwise, it’s false greater or equal to B, this is true; otherwise, it’s false
control flow if ( conditional ) { // do something }
if ( conditional ) { // do something } else { // do something else }
while ( conditional ) { // do something }
placing “break;” inside a while loop breaks out of the loop
for ( initialization; test; command ) { // do something }
“break;” and “continue;” can be used within for loops as well with identical effects
switch ( variable ) { case value1: // do something break; case value2: // do something else break; default: // do something by default break; }
this is equivalent to:
if ( conditional ) { // do something } else if ( another_conditional ) { // do something else } else { // do something as default }
placing “continue;” inside a while loop jumps to the start of the next loop
if ( variable == value1 ) { // do something } else if ( variable = value2 ) { // do something else } else { // do something by default }
this is equivalent to: initialization; while( test ) { // do something command; }
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