CMSC 104, Section 105
Problems with the for and do/while statements
1.) State which values of the control variable x are printed by each of the following:
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a.) for ( x = 2; x <= 13 ; x +=2 ) {
printf("%d \n", x);
}
b.) for ( x = 5; x <= 22; x += 7 ) {
printf("%d \n", x );
}
c.) for ( x = 3; x <= 15; x +=3) {
printf("%d \n", x );
}
d.) for ( x = 1; x <= 5; x += 7) {
printf("%d \n", x);
}
e.) for ( x = 12; x >= 2; x -= 3 ) {
printf("%d \n", x );
}
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2.) Find the errors in the following:
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a.) For ( x = 100, x >= 1, x++) {
printf("%d\n", x);
}
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b.) The following code should print whether a given integer is odd or even:
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switch (value % 2 ) {
case 0:
printf( "Even integer\n");
case 1:
printf("Odd integer\n");
}
c.) for ( x = .000001; x <= .0001; x += .000001) {
printf("%.7f\n", x );
}
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d.) The following code should output the odd integers from 999 to 1:
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for ( x = 999; x >= 1; x += 2) {
printf("%d\n", x);
}
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e.) The following code should output the even integers from 2 to 100:
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counter = 2;
Do {
if ( counter % 2 == 0) {
printf("%d \n", counter);
}
counter += 2
} While ( counter < 100);
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3.) Write for statements that print each of the following sequences:
a.) 1, 2, 3, 4, 5, 6, 7
b.) 3, 8, 13, 18, 23
c.) 20, 14, 8, 2, -4, -10
d.) 19, 27, 35, 43, 51
4.) What does the following program do?
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#include <stdio.h>
main()
{
int i, j, x, y;
printf("Enter integers in the range 1-20: ");
scanf("%d%d", &x, &y);
for ( i = 1; i <= y; i++ ) {
for ( j = 1; j <= x; j++) {
printf("@");
}
printf( "\n" );
}
}
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