Homework program C

1. In what ways are the initialization, repetition test, and update steps alike for a sentinel-controlled loop and an endfile-controlled loop? How are they different?

2. Hand trace the program that follows given the following data:

4 2 8 4 1 4 2 1 9 3 3 1 -22 10 8 2 3 3 4 5

#include

#define SPECIAL_SLOPE 0.0

int main(void)

{

double slope, y2, y1, x2, x1;

printf("Enter 4 numbers separated by spaces.");

printf(" The last two numbers cannot be the ");

printf("same, but the program terminates if ");

printf("the first two are. ");

printf(" Enter four numbers> ");

scanf("%lf%lf%lf%lf", &y2, &y1, &x2, &x1);

for (slope = (y2 - y1) / (x2 - x1);

slope != SPECIAL_SLOPE;

slope = (y2 - y1) / (x2 - x1))

{

printf("Slope is %5.2f. ", slope);

printf(" Enter four more numbers> ");

scanf("%lf%lf%lf%lf", &y2, &y1, &x2, &x1);

}

return (0);

}

3. Rewrite the program segment that follows, using a for loop:

count = 0;

i = 0;

while (i < n) {

scanf("%d", &x);

if (x == i)

++count;

++i;

}

4. Rewrite this for loop heading, omitting any invalid semicolons

for (i = n;

i < max;

++i;);

5. Write a do-while loop that repeatedly prompts for and takes input until avalue in the range 0 through 15 inclusive is input. Include code that preventsthe loop from executing forever on input of a wrong data type.