Course webpage: cs101/ CS 101 ...cs101/2019.1/lectures/Lecture7.pdf · Autumn 2019 CS101@CSE IIT...

Autumn 2019 CS101@CSE IIT Bombay

CS 101 Computer Programming and

Utilization

Puruwith

CS101 TAs and CSE Staff

Course webpage: https://www.cse.iitb.ac.in/~cs101/

Lecture 7:

http://www.cse.iitb.ac.in/~cs101/


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while vs. repeat

repeatwhile

whilerepeat

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repeat whileint n, x=0, sum=0;

cin >> n;

repeat(n) {

cin << x;

sum = sum + x;

}

cout << sum;

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repeat while

int n, x=0, sum=0;

cin >> n;

repeat(n) {

cin << x;

sum = sum + x;

}

cout << sum;

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int i=0, n, x=0, sum=0;

cin >> n;

while(i<n) {

cin << x;

sum = sum + x;

i++;

}

cout << sum;


while vs. repeat

whilerepeat

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while repeat

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// print positive integers

int n;

cin >> n;

while(n>=0) {

cout << n; // print

cin >> n; // next number

}


break

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repeat whileint n, x=0, sum=0;

cin >> n;

repeat(n) {

cin << x;

sum = sum + x;

}

cout << sum;

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int i=0, n, x=0, sum=0;

cin >> n;

while(i<n) {

cin << x;

sum = sum + x;

i++;

}

cout << sum;int i=0, n, x=0, sum=0;

cin >> n;

while(true) { //infinite loop

if(i >=n) break;

cin << x;

sum = sum + x;

i++;

}

cout << sum;


continue

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Autumn 2019 CS101@CSE IIT Bombay02/08/19 12

main_program{

float nextmark, sum = 0;

while (true){

cin >> nextmark;

if(nextmark > 100)

continue;

if(nextmark < 0)

break;

sum = sum + nextmark;

}

cout << sum << endl;

}


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#include <simplecpp>

main_program {

int n;

int first=0; int second=1;

cin >> n;

while (n<=0) // get valid input

cin >> n;

if (n==1) cout << “0” << endl;

else if (n==2) cout << “0 1” << endl;

repeat (n-2) {

num = first + second; // state update

first = second; // state update

second = num; // state update

cout << “ “ << num;

}

}

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#include <simplecpp>

main_program {

int n, digit;

cin >> n;

while (n<=0) // get valid input

cin >> n;

while (n>0) { // size of loop unknown

digit = n%10; // get last digit

n = n/10; // update number

cout << “ “ << digit;

}

}


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1.2.3.4.

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do-while

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for

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for

for(initialization; condition; update)

body

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for

Initialization

Previous statement in the program

Condition

Body

Update

Next statement in the Program

False

True


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main_program{

int n; cin >> n;

bool found = false;

for(int i=2; i < n && !found; i++){

if(n % i == 0){

found = true;

}

}

if(found) cout << "Composite.\n";

else cout << "Prime.\n";

}

Course webpage: cs101/ CS 101 ...cs101/2019.1/lectures/Lecture7.pdf · Autumn 2019 CS101@CSE IIT...

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