C++ Statements represent the lowest-level building blocks of a program and it may be like:. A simple statement is a computation terminated by a semicolon. Variable definitions and semicolon-terminated. expressions. Examples: Int i; // declaration statement ++i; // this has a side-effect double d = 10.5;// declaration statement d + 5; // useless statement!

Multiple statements can be combined into a compound statement by enclosing them within braces. ;// null statement For example: { int min, i = 10, j = 20; min = (i < j ? i : j); cout << min << '\n'; }

Where condition is the expression that is being evaluated. If this condition is true, statement is executed. If it is false, statement is ignored (not executed) and the program continues

Syntax: Syntax: If (condition) Statement; if Statement statement 1 ; else statement 2 ; if (balance > 0) { interest = balance * creditRate; balance += interest; }

If (condition) statement 1 ; else statement 2 ; if (x == 100) cout << "x is 100"; else cout << "x is not 100";

if (x == 100) { cout << "x is "; cout << x; } if (x == 100) cout << "x is 100"; Else cout << "x is not 100"; if (x > 0) cout << "x is positive"; else if (x < 0) cout << "x is negative"; else cout << "x is 0";

Int main( ) { int score; cout<< “Enter the test score :”; cin>> score ; if (score >100) cout<< “Error :score is out of range”; else if(score >= 90) cout <<‘A’ ; else if(score >= 80) cout <<‘B’ ; else if(score >= 70) cout <<‘C’ ; else if(score >= 60) cout <<‘D’ ; else if(score >= 0) cout <<‘F’ ; else cout<<“Error: Score is out of range”; } Write a program that check an entered score value using If statement.

Writ a program to solves the eqautiona*x*x+ b*x + c=0: # include main( ) { Float a,b,c; Cout<< “Enter coefficients of quadratic eqaation:”; Cin>> a>>b>>c; If (a== 0){ Cout<< “This is not quadratic equation:a==0’’; return 0; }

Cout<< the equation is :<<a<<“x^2+”<<b<<“x+”<<c<<“=0”; Double d,x1,x2; D= b*b-4*a*c; If (d<0) { Cout << this equation has no real solution :d<0\n; return 0; } X1=(-b+sqrt(d)/(2*a); X2=(-b-sqrt(d)/(2*a); Cout <<“The solution are :” x1<<“, “<<x2<< endl; }

Syntax: switch (expression) { case constant1: statements;... case constantn: statements; default: statements; } Its objective is to check several possible constant values for an expression Its objective is to check several possible constant values for an expression.

switch exampleif-else equivalent switch (x) { case 1: cout << "x is 1"; break; case 2: cout << "x is 2"; break; default: cout << "value of x unknown"; } if (x == 1) { cout << "x is 1"; } else if (x == 2) { cout << "x is 2"; } else { cout << "value of x unknown"; }

switch (operator) { case '+':result = operand1 + operand2; break; case '-':result = operand1 - operand2; break; case 'x': case '*':result = operand1 * operand2; break; case '/': result = operand1 / operand2; break; default:cout << "unknown operator: " << ch << '\n'; break; }

Syntax: While (expression) statement #include using namespace std; int main () { int n; cout "; cin >> n; while (n>0) { cout << n << ", "; --n; } cout << "FIRE!\n"; return 0; }

Syntax: do statement while (condition); int main () { unsigned long n; do { cout << "Enter number (0 to end): "; cin >> n; cout << "You entered: " << n << "\n"; } while (n != 0); return 0; }

Syntax: While (expression) statement #include using namespace std; int main () { int n; cout "; cin >> n; while (n>0) { cout << n << ", "; --n; } cout << "FIRE!\n"; return 0; }

Syntax: initialization increase statement for (initialization; condition; increase) statement ; int main () { for (int n=10; n>0; n--) { cout << n << ", "; } cout << "FIRE!\n"; return 0; }

EX: THE SUM OF THE FRIST N SQUARESHint { Int n, sum=0; cout<< “Enter a positive integer:”; cin>> n; for ( int i=1 ; i <=n ; i++) sum+ = i * i ; cout <<“The sum of the frist “<<n<<“squares is ” <<sum << endi ; }

Hint { Int sum=0; for ( int i=1 ; i <=100 ; i++) sum+ = i / (i+1) ;//sum+= (i-1)/i cout <<“The sum of 1/2+2/3+……..89/99+99/100 ” <<sum << endi ; }

{ Int n, sg= 1,sum=0; cout<< “Enter a positive integer:”; for ( int i=1 ; i <=n ; i++) sum+ = sg*i ; sg= -1*sg ; cout <<“The sum of 1/2+2/3+……..98/99+99/100 ” <<sum << endi ; }

An array is a series of elements of the same type placed in contiguous memory locations. An array variable is defined by specifying its dimension and the type of its elements. Int heights [10];

const int size = 3; double Average (int nums[size]) { double average = 0; for (register i = 0; i < size; ++i) average += nums[i]; return average/size; }