3_The For Statements in C_Language

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There are plenty of different ways to write a program for a particular task. Let's try a variation on the temperature converter.





#include

main()

{

int fahr;



for(fahr=0;fahr<=300;fahr=fahr+20;)

printf("%3d%/t%6.1f\n",fahr,(5.0/9.0)*(fahr-32));



getch();

return 0;

}




Using for statement, it become more easy and small program to create Temperature Table like previous one.




The for statement is a loop, a generalization of the while. If you compare it to the earlier while, its operation should be clear. Within the parentheses, there are three parts, separated by semicolons. The first part, the initialization


fahr = 0


is done once, before the loop proper is entered. The second part is the test or condition that controls the loop:


fahr <= 300


This condition is evaluated; if it is true, the body of the loop (here a single ptintf) is executed. Then the increment step


fahr = fahr + 20


is executed, and the condition re-evaluated. The loop terminates if the condition has become false. As with the while, the body of the loop can be a single statement or a group of statements enclosed in braces. The initialization, condition and increment can be any expressions. The choice between while and for is arbitrary, based on which seems clearer. The for is usually appropriate for loops in which the initialization and increment are single statements and logically related, since it is more compact than while and it keeps the loop control statements together in one place.

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