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Loops are used when we want to execute a part of program or block of statement several times. So, a loop may be defined as a block of statements which are repeatedly executed for a certain number of times or until a particular condition is satisfied. There are three types of loop statements in C: 1. For 2. While 3. Do...while Each loop consists of two segments, one is k/a the control statement and the other is the body of the loop. The control statement in loop decides whether the body is to be executed or not. Depending on the position of control statement in the loop, loops may be classified either entry_controlled loop or exit_controlled loop. While and For are entry_controlled loops where as do...while is exit_controlled loop. For Loop : For loops is useful to execute a statement for a number of times. When the number of repetitions is known in advance, the use of this loop will be more efficient. Thus, this loop is also known as determinate or definite loop. ...

          The statements which alter the flow of execution of the program are called control statements. In the absence of control statements, the instruction or statements are executed in the same order in which they appear in the program. Sometimes, we may want to execute some statements several times. Sometime we want to use a condition for executing only a part of program. So, control statements enable use to specify the order in which various instruction in the program are to be executed. There are two types of control statements : 1. Loops : for, while, do-while 2. Decisions: if, if...else, nested if....else, switch