Sams Teach Yourself C in 21 Days

TheelseClause ..............................................................................................

Anifstatement can optionally include an elseclause. The elseclause is included as

follows:

if (expression)

statement1;

else

statement2;

Ifexpressionevaluates to true,statement1is executed. If expressionevaluates to

false, control goes to the elsestatement,statement2,which is then executed. Both

statement1andstatement2can be compound statements or blocks.

Listing 4.4 shows the program in Listing 4.3 rewritten to use an ifstatement with an

elseclause.

LISTING4.4 List0404.c. An ifstatement with an elseclause

1: /* Demonstrates the use of if statement with else clause */

2:

3: #include <stdio.h>

4:

5: int x, y;

6:

7: int main( void )

8: {

9: /* Input the two values to be tested */

10:

11: printf(“\nInput an integer value for x: “);

12: scanf(“%d”, &x);

13: printf(“\nInput an integer value for y: “);

14: scanf(“%d”, &y);

15:

16: /* Test values and print result */

17:

18: if (x == y)

19: printf(“x is equal to y\n”);

20: else

21: if (x > y)

22: printf(“x is greater than y\n”);

23: else

24: printf(“x is smaller than y\n”);

76 Day 4

You will notice that the statements within an ifclause are indented. This is

Note a common practice to aid readability.

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