Unconditional statements are statements that are invoked unconditionally. Conditional statements have a controlling expression, while unconditional statements do not. For example:
void f (bool b) {
if (b==true) do_something(); // conditional statement (controlled by the expression b==true)
do_something_else(); // unconditional (executes regardless of b's value)
}
An unconditional goto is a goto that has no associated conditional expression. The following example demonstrates conditional and unconditional goto statements. int x=rand(); if (x) goto label_1; // conditional goto (when x is non-zero) else goto label_2; // conditional goto (when x is zero) label_1: // ... goto label_3; // unconditional goto (jump past label_2) label_2: // ... label_3: // ...
x = 12;
A 'goto' statement is an unconditional requirement to go to that part of the program. As such, statements like these cause programs to become unstructured and should be avoided if possible. Goto statements lead to some sloppy and unreadable logic.
The semi-colon converts a C++ expression into a statement.
Statements that check an expression then may or may not execute a statement or group of statements depending on the result of the condition.
The C programming language is generally made up of common conditional statements. Occasionally, unconditional statements such as test that are based on imperative commands.
An unconditional goto is a goto that has no associated conditional expression. The following example demonstrates conditional and unconditional goto statements. int x=rand(); if (x) goto label_1; // conditional goto (when x is non-zero) else goto label_2; // conditional goto (when x is zero) label_1: // ... goto label_3; // unconditional goto (jump past label_2) label_2: // ... label_3: // ...
Control statements are statements that alter the flow of execution according to the evaluation of an expression (the condition). The C++ control statements are ifstatements, switch statements and the tertiary conditional operator, ?:.
There is no difference. Both statements are invalid.
x = 12;
A 'goto' statement is an unconditional requirement to go to that part of the program. As such, statements like these cause programs to become unstructured and should be avoided if possible. Goto statements lead to some sloppy and unreadable logic.
The semi-colon converts a C++ expression into a statement.
Decision making statements make use of conditional expressions. In C++ there are three possibilities: if/else, switch/case and the ternary operator (?:).
Control instructions are instructions that alter the flow of execution. In C++ this include if, if-else statements, switch-case statements and the conditional ternary operator (?:), as well as loop structures (for, while, do-while) and procedural goto statements.
Statements that check an expression then may or may not execute a statement or group of statements depending on the result of the condition.
There are several 'looping' statements in C++. They are:while () { }do { } while () ;for (index-start, index-end; index increment/decrement) { }They are used to repetitively execute statements as long as the statement(s) controlling the loop are true.
for( ; ; ) { statement_block; } while( conditional_expression ) { statement_block; } do { statement_block; }while( conditional_expression )