C programming increment & decrement operator and Exercise

Increment operators are used to increasing the value of the variable and decrement operators are used to decrease the value of the variable in C programs

increment operator :++var_name; or var_name++;

decrement operator :–var_name; or var_name–;

Example

The following table displays an explanation on increment and decrement operators

The increment operator ++ adds 1 to its variable

x=x+1;                                                                    x=x+1;

is the same as                               So                       can be written

x++;                                                                        ++x;

output

program 2

#include <stdio.h>
#include <stdlib.h>

int main()
{
int x=10;
int b;

printf(“Hello world!n”);
printf(“b value is %dn”,x++ + x++);
printf(“b value is %dn”,x);
printf(“b value is %dn”,++x + ++x);
printf(“b value is %dn”,x);
printf(“b value is %dn”,x– – x–);
printf(“b value is %dn”,x);
printf(“b value is %dn”,–x – –x);
printf(“b value is %dn”,x);
return 0;
}

program 3

#include <stdio.h>
#include <stdlib.h>

int main()
{
int x=10;
int y=5;
int b;

printf(“Hello world!n”);
printf(“b value is %dn”,x++ + x++ + y++);
printf(“b value is %dn”,x);
printf(“b value is %dn”,y);
printf(“b value is %dn”,++x + ++x + ++y);
printf(“b value is %dn”,y);
printf(“b value is %dn”,x– – x– – y–);
printf(“b value is %dn”,x);
printf(“b value is %dn”,y);
printf(“b value is %dn”,–x – –x – –y);
printf(“b value is %dn”,x);
printf(“b value is %dn”,y);
return 0;
}

 

program 4

#include <stdio.h>
#include <stdlib.h>

int main()
{
int x;
int y;
int a;
int z;
printf(“Enter a positive integer xn”);
scanf(“%d”,&x);
printf(“(++x) x is incremented value by 1 = %dnn”,++x);
printf(“Enter a positive integer xn”);
scanf(“%d”,&x);
printf(“(–x) x is deccremented value by 1 = %dnn”,–x);
printf(“Enter a positive integer yn”);
scanf(“%d”,&y);
printf(“(y–) y is decremented value by 1 but after assign y = %dnn”,y–);
printf(“Enter a positive integer yn”);
scanf(“%d”,&y);
printf(“(y++) y is incremented value by 1 but after assign y = %dnn”,y++);

return 0;
}

program 5

#include <stdio.h>
#include <stdlib.h>

int main()
{
int x;
int y;
int a;
int z;
printf(“Enter a positive integer xn”);
scanf(“%d”,&x);
printf(“(++x) x is incremented value by 1 = %dnn”,++x);

printf(“Enter a positive integer xn”);
scanf(“%d”,&x);
printf(“(–x) x is deccremented value by 1 = %dnn”,–x);
printf(“Enter a positive integer yn”);
scanf(“%d”,&y);
printf(“(y–) y is decremented value by 1 but after assign y = %dnn”,y–);
printf(“reperint of x = %dnn”,y);     // reperint y value is decremented by 1
printf(“Enter a positive integer yn”);
scanf(“%d”,&y);
printf(“(y++) y is incremented value by 1 but after assign y = %dnn”,y++);
printf(“reperint of x = %dnn”,y);  // reperint y value is incremented by 1

return 0;

}

When the above code is executed, it produces the following result

Are you identify what are the different between above the program 4 and program 5

program 6

include <stdio.h>
#include <stdlib.h>

int main()
{
int x;
int y;
printf(“Hello kannan!n”);
printf(“hello enter a number negetive or positive!n”);
scanf(“%d”,&x);
printf(“plese enter incrementel value!n”);
scanf(“%d”,&y);
printf(“your answer is %d”,x+=y);
return 0;
}

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