Question

Only using 'if', 'else', 'else if' statements PLZ.

Sample input/output Program2 Please enter heading for waypoint 1 in degrees: 50 Please enter distance to waypoint 1 in meters: 2671 Move on heading due East for 1716.94 meteras Move on heading due North for 2046.06 motors Please enter heading for waypoint 2 in degrees: 170 Please enter distance to waypoint 2 in meters: 8329 Move on heading due Weat for 8202.34 meters Move on heading due North for 1447.03 meters Please enter heading for waypoint 3 in degrees: 260 Please enter distance to waypoint 3 in meters: 1920 Move on heading due West for 333.66 meters Move on heading due South for 1890.79 meters Please enter target bearing in degrees: -12 Please enter target range in meters: 200 Run Silent, Run Deep Students took possession of a WWII submarine named the Sword-Fish, which is diesel electric with no electronics on board and a small electrical computer, then set out to sink the enemy. The compass on the sub is worn out and only the East, North, West and South markers are distinguishable, and hence can only navigate in those four directions. Write a program as follows: Asks the user for the magnitude (distance), in meters, and the heading, in degrees of the navigation to - -Decompose the vector into x and y components and output the magnitude and direction (North, West Fire torpedo on heading -11.4 degroes with a spread of 2 degrees South, or East are the only reliable headings on the sub's compass) of the x component and then the y component. The x component is the magnitude multiplied by the cosine of the angle. The y component is the magnitude multiplied by the sine of the angle. Determine compass direction depending on weather the vector component is positive or negative This step has to be repeated for waypoints two and three. Ask the user for the target bearing (-30 to 30 degrees) and range (distance in meters). Output a firing solution as follows EMPLATE: must use this #includestdieb int main(void) - - Range 100 to 499 500 to 999 1000 to 1499 1500 to 2000 Tor x0.05 x 0.08 Bearing bearing x0.10 Bearing+ bearing x0.12 Return O; Bearing bea Target Torpedo spread 5 degrees 14 to -1 0 to 14 No input validation is required, assume user will enter values of correct type and range Note: Create variables to store data as needed.

Answer 1

Below is the C code.I hope that i have provided sufficient comments for you better understanding.

#include <stdio.h>
#include <math.h>

//define value of PI
#define PI 3.14159265

//This will return absolute value
double absolute(double);

int main ()
{
double degree,distance,resdegree;

//Take inputs for the 3 way points

//1st INPUT
//Take degree as input
printf("Please enter heading for waypoint 1 in degrees : ");
scanf("%lf",&degree);

//Take distance as input
printf("Please enter distance to waypoint 1 in meters : ");
scanf("%lf",&distance);

//print the x component that is cos component
//If direction is in 1st and 4th quadrant then East direction else West
if( (degree>=270&&degree<=360) || (degree>=0&&degree<=90) )
{
printf("Move on heading due East for %f meters\n",distance * cos( degree*(PI/180.0) ) );
}
else
{
printf("Move on heading due West for %f meters\n",-distance *cos( degree*(PI/180.0) ) );
}
//print the y component that is sin component
//If direction is in 1st and 2nd quadrant then North direction else South
if(degree>=0&&degree<=180)
{
printf("Move on heading due North for %f meters\n",distance * sin( degree*(PI/180.0) ) );
}
else
{
printf("Move on heading due South for %f meters\n",-distance * sin( degree*(PI/180.0) ) );
}

//2nd INPUT
//Take degree as input
printf("Please enter heading for waypoint 2 in degrees : ");
scanf("%lf",&degree);

//Take distance as input
printf("Please enter distance to waypoint 2 in meters : ");
scanf("%lf",&distance);

//print the x component that is cos component
//If direction is in 1st and 4th quadrant then East direction else West
if( (degree>=270&&degree<=360) || (degree>=0&&degree<=90) )
{
printf("Move on heading due East for %f meters\n",distance * cos( degree*(PI/180.0) ) );
}
else
{
printf("Move on heading due West for %f meters\n",-distance *cos( degree*(PI/180.0) ) );
}
//print the y component that is sin component
//If direction is in 1st and 2nd quadrant then North direction else South
if(degree>=0&&degree<=180)
{
printf("Move on heading due North for %f meters\n",distance * sin( degree*(PI/180.0) ) );
}
else
{
printf("Move on heading due South for %f meters\n",-distance * sin( degree*(PI/180.0) ) );
}

//3rd INPUT
//Take degree as input
printf("Please enter heading for waypoint 3 in degrees : ");
scanf("%lf",&degree);

//Take distance as input
printf("Please enter distance to waypoint 3 in meters : ");
scanf("%lf",&distance);

//print the x component that is cos component
//If direction is in 1st and 4th quadrant then East direction else West
if( (degree>=270&&degree<=360) || (degree>=0&&degree<=90) )
{
printf("Move on heading due East for %f meters\n",distance * cos( degree*(PI/180.0) ) );
}
else
{
printf("Move on heading due West for %f meters\n",-distance *cos( degree*(PI/180.0) ) );
}
//print the y component that is sin component
//If direction is in 1st and 2nd quadrant then North direction else South
if(degree>=0&&degree<=180)
{
printf("Move on heading due North for %f meters\n",distance * sin( degree*(PI/180.0) ) );
}
else
{
printf("Move on heading due South for %f meters\n",-distance * sin( degree*(PI/180.0) ) );
}

//Take input for target and range
printf("Please enter target bearings in degrees : ");
scanf("%lf",&degree);

printf("Please enter target range in meters : ");
scanf("%lf",&distance);

//Checking for the given condition on range
if(distance>=100&&distance<=499)
{
resdegree=degree+ absolute(degree*0.05);
}
else if(distance>=500&&distance<=999)
{
resdegree=degree+ absolute(degree*0.08);
}
if(distance>=1000&&distance<=1499)
{
resdegree=degree+ absolute(degree*0.10);
}
if(distance>=1500&&distance<=2000)
{
resdegree=degree+ absolute(degree*0.12);
}

//Checking for the given condition on target bearing
if( (degree>=-30&&degree<=-15) || (degree>=15&&degree<=-30) )
printf("Fire torpedo on heading %f degrees with a spread of a 5 degrees\n",resdegree);
else if( degree>=-14 && degree<=14)
printf("Fire torpedo on heading %f degrees with a spread of a 2 degrees\n",resdegree);
return(0);
}
double absolute(double n)
{
if(n<0)
return -n;
return n;
}

Below is the screenshot of output-

Instead of checking the direction by applying condition on degree 3 times,you can make a function which will make the code more appealing and easy to understand and you won't need to write the same piece of code again & again.But as mentioned in the question,I only used if and else .

Hope i have answered your question satisfactorily.Leave doubts in comment section if any.