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Conditional Execution programs
Posted Date: 14 Jun 2008 Resource Type: Articles/Knowledge Sharing Category: Computer & Technology
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Posted By: Lenin Member Level: Diamond
Rating:  Points: 1
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Conditional Execution programs
This section contains example programs demonstrating if else and select
statements (also break and continue statements).
This program demonstrates the if else statement.
#include
main()
{
int a , b;
printf("Enter two numbers: ");
scanf("%d%d" , &a , &b);
if (b) printf("%d\n" , a/b);
else printf("... cannot divide by zero\n");
}
Another example of if else statement.
#include
#include
main()
{
int a,b;
char ch;
printf("Do you want to: \n");
printf"Add, subtract, Multiply, or Divide?\n");
/* force user to enter valid response */
do {
printf("Enter first letter: ");
ch=getchar();
printf("\n");
} while (ch!='A' && ch!='S' && ch!='M'
printf("Enter first number: ");
scanf("%d", &a);
printf("Enter second number: ");
scanf("%d", &b);
if (ch=='A') printf("%d", a+b);
else if (ch=='S') printf("%d", a-b);
else if (ch=='M') printf("%d", a*b);
else if (ch=='D' && b!=0) printf("%d", a/b);
&& ch!='D');
}
The switch statement is often used to process menu commands.
#include
#include
main()
{
int a,b;
char ch;
printf("Do you want to:\n");
printf("Add, Subtract, Multipy, or Divide\n");
/* force user to enter valid response */
do (
printf("Enter first letter: ");
ch =getchar();
printf("\n");
} while (ch!='A' && ch!='S' && ch!='M'
printf("Enter first number: ");
scanf("%d", &a);
printf("Enter second number: ");
scanf("%d", &b);
switch (ch) {
case 'A' : printf("%d", a+b);
break;
case 'S' : printf("%d", a-b);
break;
case 'M' : printf("%d", a*b);
break;
case 'D' : if (b!=0) printf("%d", a/b);
break;
}
}
&& ch!='D');
The statement sequence associated with a case may be empty allowing two
or more cases to share a common statement sequence.
#include
#include
main()
{
char ch;
printf("Enter the letter: ");
ch=getchar();
switch(ch) {
case 'a' :
case 'e' :
case 'i' :
case 'o' :
case 'u' :
printf(" is a vowel \n");
break;
default:
printf(" is a consonant");
}
}
A simple program to show the use of the continue statement.
#include
main()
{
int x ;
for ( x=0 ; x<=100 ; x++) {
if (x%2) continue; /* using modulus operation */
printf("%d\n" , x);
}
This program jumps out of an infinite loop using the break statement.
#include
main()
{
int t ;
for ( ; ; ) {
scanf("%d" , &t) ;
if ( t==10 ) break ;
}
printf("End of an infinite loop...\n");
}
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