Nesting Conditions in C

using compound relational tests or using nested conditions. When conditions are nested the if-else/ifelse-

if construct may contain other if-else/if-else-if constructs within themselves. In nesting you must be careful to keep track of different ifs and corresponding elses. Consider the following example:

if (a>=2)

if (b >= 4)

printf("Result 1");

else

printf("Result 2");

An else matches with the last if in the same block. In this example the else corrosponds to the second if. Therefore if both a >= 2 AND b >= 4 are TRUE “Result 1” will be displayed; if a>= 2 is TRUE but if b >= 4 is FALSE “Result 2” will be displayed. If a >= 2 is FALSE nothing will be displayed. To reduce any confusion braces can be used to simplify the source code. Therefore the above can be rewritten as follows:

if (a>=2)

{

if (b >= 4)

printf("Result 1");

else

printf("Result 2");

}

In the above, if else is to be associated with the first if then we can write as follows:

if (a>=2)

{

if (b >= 4)

printf("Result 1");

}

else

printf("Result 2");

Exercise 4.4 – Rewrite the program in Example 4.3 using nested conditions (i.e. using braces ‘{‘ and

‘}’.