Question 1 

// This program enables the user to enter temperatures for 31 days of January and 

// prints the average of the temperatures over 30, between 20 and 30 and below 20 
//degrees 

#include <iostream.h> 

#include <conio.h> 

void main() 

{ 

float sumo30=0; // sum of numbers above 30 

int numo30=0; // amount of num above 30 

float sumu30=0; // sum of temp between 20 and 30 

int numu30=0; // amount of temp between 20 and 30 

float sumu20=0; // sum of temp above u 20 

int numu20=0; // sum of temp 20 

for(int i=1;i<32;i++) // loop from 1 to 31, (31 days) 

{ 

float temp; 

cout << "Enter temperature for day " << i << ":"; 

cin >> temp; // input of temp, no restrictions, 

if(temp<20) 

{ 

sumu20+=temp; // sum temp 

numu20++; // increase count 

} 

else if(temp<=30) 

{ 

sumu30+=temp; 

numu30++; 

} 

else 

{ 

sumo30+=temp; 

numo30++; 

} 

} 

float mo30; 

float mu30; 

float mu20; 

if(numo30) 

{ 

mo30=sumo30/numo30; 

} 

if(numu30) 

{ 

mu30=sumu30/numu30; 

} 

if(numu20) 

{ 

mu20=sumu20/numu20; 

} 

float ma=(sumo30+sumu30+sumu20)/(numo30+numu30+numu20); 

cout << "Average of temps over 30: " << mo30 << "\n"; 

cout << "Average of temps over 20 and under 30: " << mu30 << "\n"; 

cout << "Average of temps under 20: " << mu20 << "\n"; 

cout << "Average of all temps: " << ma << "\n"; 

cout << "press enter"; 

getch(); 

} 

Question 2 

// Calculates the fuel consumption of cars and states whether it's a good, fair or poor 

// consumption 

#include <iostream.h> 

#include <conio.h> 

void main() 

{ 

int goodc=0; 

int fairc=0; 

int poorc=0; 

float input; 

cout << "Please enter fuel consumption: "; 

cin >> input; 

while(input>0) 

{ 

cout << "Please enter fuel consumption: "; 

cin >> input; 

if(input<7) 

{ 

goodc++; 

} 

else if(input>10) 

{ 

poorc++; 

} 

else 

{ 

fairc++; 

} 

} 

cout << "there are " << goodc << " cars with good consumption\n"; 

cout << fairc << " cars with fair consumption\n"; 

cout << "and " << poorc << " cars with poor consumption\n"; 

getch(); 

} 

Question 2 – TRACE TABLE 

Question 3 

// reads in the grades for 10 students (between 0 ..100) and outputs the average of the 
// students that have passed/failed 

#include <iostream.h> 

#include <conio.h> 

void main() 

{ 

int sumg=0; 

int numg=0; 

int sumb=0; 

int numb=0; 

for(int i=1;i<11;i++) 

{ 

int temp; 

do 

{ 

cout << "Students grade " << i << " (0...100): "; 

cin >> temp; 

} while(temp<0 || temp>100); 

if(temp>50) // assumed that above 50 means passed 

{ 

sumg+=temp; 

numg++; 

} 

else 

{ 

sumb+=temp; 

numb++; 

} 

} 

float mg=0; 

float mb=0; 

if(numg) 

{ 

mg=float(sumg)/float(numg); 

} 

if(numb) 

{ 

mb=sumb/numb; 

} 

cout << numg << " Students with an average of " << mg << " have passed\n"; 

cout << numb << " Students with an average of " << mb << " have failed\n"; 

getch(); 

} 

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