C++

2.1: Write a program to display the following output using a single cout statement

Maths = 90
Physics = 77
Chemistry = 69
Solution:

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#include #include int main() {            char *sub[]={"Maths","Physics","Chemestry"};            int mark[]={90,77,69};            for(int i=0;i<3 code="" i="">             { cout<"="<              }     return 0; }

output

Maths = 90
Physics = 77
Chemistry = 69

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2.2: Write a program to read two numbers from the keyboard and display the larger value on the screen.

Solution:

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#include #include int main() {     float a,b;         cout<<" Enter two values  :"<     cin>>a>>b;     if(a>b)         cout<<" larger value = "<     else         cout<<" larger value = "<     return 0; }

output

Enter two values : 10 20
larger value = 20

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2.3:Write a program to input an integer from the keyboard and display on the screen “WELL DONE” that many times.


Solution:

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Solution: #include #include int main() {     int n;     char *str;     str="WELL DONE";     cout<<" Enter an integer value ";     cin>>n;     for(int i=0;i     {         cout<     }     return 0; }

output

Enter an integer value 5
WELL DONE
WELL DONE
WELL DONE
WELL DONE
WELL DONE

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2.4: Write a program to read the values a, b and c and display x, where
x = a / b –c.
Test the program for the following values:
(a) a = 250, b = 85, c = 25
(b) a = 300, b = 70, c = 70


Solution: 

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#include #include int main() {      float a,b,c,x;      cout<<" Enter the value of a,b, &c :"<      cin>>a>>b>>c;      if((b-c)!=0)      {             x=a/(b-c);             cout<<" x=a/(b-c) = "<      }      else      {          cout<<"  x= infinity "<      }      return 0; }

During First Run:

output

Enter the value of a,b, &c : 250 85 25
x=a/(b-c) = 4.166667

During Second Run:

output

Enter the value of a,b, &c : 300 70 70
x= infinity

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2.5: Write a C++ program that will ask for a temperature in Fahrenheit and display it in Celsius

Solution:

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#include #include int main() {     float f,theta;     cout<<" Enter  the temperature in Feranhite    scale  : ";     cin>>f;     theta=((f-32)/9)*5;     cout<<" Temperature in Celsius =  "<     return 0; }

output

Enter the temperature in Feranhite scale : 105
Temperature in Celsius = 40.555557

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2.6:Redo Exercise 2.5 using a class called temp and member functions.


Solution:

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#include #include class temp {     float f,theta; public:     float conversion(float f); }; float temp::conversion(float f) {     theta=((f-32)/9)*5;     return theta; } int main() {     temp t;     float f;     cout<<" Enter temperature in Farenheite scale :"<     cin>>f;     cout<<" Temperature in Celsius scale = "<     return 0; }

output

Enter the temperature in Feranhite scale : 112
Temperature in Celsius = 44.444443

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