what is the difference between = and ==?

your if statement should be if(strlen(str)==0)

Why not g++ ?

I will try with that. Thank you. strangely, in my header file, it says that #include <string> file not found. :/ But the same code line is working in .cpp extension.

#include<iostream> using namespace std; class calculator { public: int sum , multiply , divide , sub ; void Answers(int sum , int sub , int multiply , int divide){ cout<< " The sum of a and b = " << sum << endl; cout<< " The sub of a and b = " << sub << endl; cout<< " The multiplication of a and b = " << multiply << endl; cout<< " The divition of a and b = " << divide << endl;} int add(int a , int b ){ int sum ; sum = a + b ; return sum ; } int Mul(int a , int b ){ int multiply; multiply = a * b ; return multiply ; } int dvd(int a , int b ){ int divide ; divide = a / b ; return divide ;} int subtract(int a , int b ){ int sub ; sub = a - b ; return sub ;} }; int main() { int sum , sub , multiply,divide,a = 5 ,b = 2 ; calculator maths; maths.Answers(sum , sub , multiply,divide); }

You set a and b and not using them. You use sum, sub, multiply and divide, but you have not initialized them

Didnt get it

I want a = 5 , b = 3 got sum , sub , multiply , and divide and give me answers

Let's investigate one variable sum. In main you have this variable not initialized (so it has some garbage value), then you pass it to your Answers method and then you just print this garbage value. For other 3 variables happens the same. And you don't do anything with a and b.

I used sum and 3 other because that it is asking for in object of class

And also note that you have arguments, local variables and member variables named the same but they are different variables.

In which lines i have mistake

In which lines i have mistake

#include<iostream> using namespace std; int main() { int a, b, c, d, e; int total; float average; cout <<"Input first number : "; cin >> a; cout <<"Input second number : "; cin >> b; cout <<"Input third number : "; cin >> c; cout <<"Input 4th number : "; cin >> d; cout <<"Input last number : "; cin >> e; total = a+b+c+d+e; average = total/5; cout <<"Total is " <<total; cout<<endl; cout <<"Average is " <<average << endl; return 0; }

#include<iostream> using namespace std; int main() { int a, b, c, d, e; int total; float average; cout <<"Input first number : "; cin >> a; cout <<"Input second number : "; cin >> b; cout <<"Input third number : "; cin >> c; cout <<"Input 4th number : "; cin >> d; cout <<"Input last number : "; cin >> e; total = a+b+c+d+e; average = total/5; cout <<"Total is " <<total; cout<<endl; cout <<"Average is " <<average << endl; return 0; }

You are doing integral division, one way to solve it you can divide by 5.0f not by 5

You are doing integral division, one way to solve it you can divide by 5.0f not by 5

do you mean float=total;

1/Write a program that asks the user to type 5 integers and writes the average of the 5 integers. 2/Write a program that asks the user to type 2 integers A and B and exchange the value of A and B. 3/Write a program that asks the user to type the price without tax of one kilogram of tomatoes,the number of kilograms you want to buy and the tax in percent units. The program must write the total price including taxes.

1/Write a program that asks the user to type 5 integers and writes the average of the 5 integers. 2/Write a program that asks the user to type 2 integers A and B and exchange the value of A and B. 3/Write a program that asks the user to type the price without tax of one kilogram of tomatoes,the number of kilograms you want to buy and the tax in percent units. The program must write the total price including taxes.

your if statement should be if(strlen(str)==0)

[Error] 'else' without a previous 'if'

you have an else without a previous if

#include<iostream> using namespace std; int main() { int number; char array1[][10]={"one","two","three","four","five","six","seven","eight","nine","ten"}; char array2[][10]={"eleven","twelve","thirteen","fourteen","fifteen","sixteen","seventeen","eighteen","nineteen"}; char array3[][10]={"twenty","thirty","fourty","fifty","sixty","seventy","eighty","ninty","hundred"}; cin>>number; { if(number<0); cout<<"the number is negative number"; else if(number>0 && number<=10) cout<<"the number is "<<array1[number-1]; } return 0; }

#include<iostream> using namespace std; int main() { int number; char array1[][10]={"one","two","three","four","five","six","seven","eight","nine","ten"}; char array2[][10]={"eleven","twelve","thirteen","fourteen","fifteen","sixteen","seventeen","eighteen","nineteen"}; char array3[][10]={"twenty","thirty","fourty","fifty","sixty","seventy","eighty","ninty","hundred"}; cin>>number; { if(number<0); cout<<"the number is negative number"; else if(number>0 && number<=10) cout<<"the number is "<<array1[number-1]; } return 0; }

got it thank you :)

why its always give "please input your name" even if i gave input https://pastebin.com/asz0rrp9

hey @coalio can i ask you. when i input my name with nothing (just enter) it just pass away with Hello,

if(strlen(str) !=0){ printf("Please input your name\n"); }

thank you but when i use that it still give same result

"If the string len is not 0 then print"

so the right was if(strlen(str) == 0){ printf("Please input your name\n") }

btw its recommendable to always use braces in conditionals

btw its recommendable to always use braces in conditionals

#include<iostream> using namespace std; int main() { int number,a1,a2; char array1[][10]={"one","two","three","four","five","six","seven","eight","nine","ten"}; char array2[][10]={"eleven","twelve","thirteen","fourteen","fifteen","sixteen","seventeen","eighteen","nineteen"}; char array3[][10]={"twenty","thirty","fourty","fifty","sixty","seventy","eighty","ninty","hundred"}; cin>>number; { if(number<0) cout<<"the number is negative number"; else if(number>0 && number<=10) cout<<"the number is "<<array1[number-1]; else if(number>10 && number<20) cout<<"the number is "<<array2[number-11]; else if(number>=20 && number<=100) a1=number/10; a2=number%10; cout<<"the number is "<<array3[a1-2]<<" "<<array1[a2-1]; } return 0; }

but when i implement that it gave same result

paste a return 1; after the printf

#include<iostream> using namespace std; int main() { int number,a1,a2; char array1[][10]={"one","two","three","four","five","six","seven","eight","nine","ten"}; char array2[][10]={"eleven","twelve","thirteen","fourteen","fifteen","sixteen","seventeen","eighteen","nineteen"}; char array3[][10]={"twenty","thirty","fourty","fifty","sixty","seventy","eighty","ninty","hundred"}; cin>>number; { if(number<0) cout<<"the number is negative number"; else if(number>0 && number<=10) cout<<"the number is "<<array1[number-1]; else if(number>10 && number<20) cout<<"the number is "<<array2[number-11]; else if(number>=20 && number<=100) a1=number/10; a2=number%10; cout<<"the number is "<<array3[a1-2]<<" "<<array1[a2-1]; } return 1; }

why the d after thirty

array1[a2-1];

what is this supposed to contain if the first array already has the entire number in it