Perfectly legal and usable.
if any 'if' contains another if within its body and 'else' contains another else within its body then this is known as nested if or else.
Yes.
If(condition) { if-else statement; } else { if-else statement; }
Nesting can be a very handy tool in C++, but should be avoided if possible.C++ gives us If statements, For loops and many other things. These can be nested. For example:A nested If statement://outer if statementIf( this is true ){//nested if statementif( this is also true ){//do something}else{//do something else}}
Many if..then..else statements in one. eg from Java if (this_is_true) { if (this_is_also_true) {//do this } else { //first statement was true, second was false } } else { //Nothing was true }
nested if statements. Example: If condition is right then if condition is even better then ... else ... end if else if condition is worse then ... else ... end if end if
Nothing, but be careful with the dangling else's: if (cond1) if (cond2) stmt1; else stmt2; means: if (cond1) { if (cond2) stmt1; else stmt2; } not this: if (cond1) { if (cond2) stmt1; } else stmt2;
What you are asking would be not be a nested if then else statement, in pseudocode what you are asking would be:if condition thendo thiselsedo that[this is pseudo code because the 'and' would be rendered differently in other languages and there potentially would be statement terminators, etc]A nested if statement would be:if condition1 thenif condition2 thendo thiselsedo thiselsedo thatThe second if statement is nested within the first one, clearly the nesting can go on quite deeply.
In Nested Logic a Logic is contained within a Logic. If the Outer Logic is TRUE then the internal Logic is executed. Nested IF, Nested For, Nested While, e.t.c are some examples of Nested Logic in Modern Computer Languages.
Nested was created in 1977.
ask someone else
You use a nested if when the condition is dependent upon another condition. For example: if (ptr != nullptr) { // ptr is non-null -- test the value it refers to if (ptr* == 0) { // the value pointed to by ptr is zero } else { // the value pointed to by ptr is non-zero } } In this case, the alternative to a nested if creates an inefficiency: if (ptr != nullptr && *ptr == 0 ) { // ptr is valid and refers to the value zero } else if (ptr != nullptr) { // ptr is valid and refers to a non-zero value } In this example, the expression "ptr != nullptr" is evaluated twice when ptr is valid and refers to a non-zero value. The nested if only evaluates this expression one time.