CMSC 104
Problems with the if and while statements
1.)Identify and correct the errors in the following ( Note: there may be more than one error)
<![CDATA[
if (age >= 65);
{
printf("Age is greater than or equal to 65\n");
}
else
{
printf("age is less than 65\n");
}
]]>
<![CDATA[
int x = 1, total;
while (x <= 10)
{
total = total + x;
x = x + 1;
}
]]>
<![CDATA[
while ( y > 0 )
{
printf(" %d\n", y );
y = y + 1 ;
}
]]>
2.) What does the following program print?
<![CDATA[
main()
{
int x = 1, total =0, y;
while (x <= 6)
{
y = x * x;
printf( "%d\n", y);
total = total + y;
x = x + 1;
}
printf("Total is %d\n", total);
return 0;
}
]]>
3.) Determine the output for each of the following when x is 9 and y is 11, and when x is 11 and y is 9. Note: the compiler ignores indentation, and it always associates an else with the previous if unless told to do otherwise by the placement of braces { }. Hint: ( apply indentation conventions you have learned)
a.)
<![CDATA[
if (x < 10)
if (y > 10)
printf("******\n");
else
printf("######\n");
printf("$$$$$$\n");
]]>
b.)
<![CDATA[
if (x < 10) {
if (y > 10)
printf("******\n");
}
else {
printf("######\n");
printf("$$$$$$\n");
}
]]>
c.)
<![CDATA[
float a, b, c;
a = 3.0;
c = 2.0;
a *= b = a + 5.0 ;
a *= b += c = c + a ;
printf("%f \n", a>b ? a : b );
a>b ? printf("a is larger than b\n") : printf(" b is larger than a\n");
]]>
4.) Modify the following code to produce the output shown. Use proper indentation techniques. You may only insert braces. Note: it is possible that no modification is needed for some cases.
<![CDATA[
if (y = = 8)
if (x = = 5)
printf("@@@@@@\n");
else
printf("######\n");
printf("$$$$$$\n");
printf("&&&&&&\n");
]]>
a.) Assuming x = 5 and y = 8, the following output is produced:
<![CDATA[
@@@@@@
$$$$$$
&&&&&&
]]>
b.) Assuming x = 5 and y = 8, the following output is produced:
<![CDATA[
@@@@@@
]]>
c.) Assuming x = 5 and y = 8, the following output is produced:
<![CDATA[
@@@@@@
&&&&&&
]]>
d.) Assuming x = 5 and y = 7, the following output is produced:
<![CDATA[
######
$$$$$$
&&&&&&
]]>