C++ Which of the following is a correct way to ensure that once we read a nonnegative value into x, the loop will stop? (1) int x; while(x < 0){ cin >> x; if(x < 0) cout << “x must be >=0”; } (2) int x; for(cin >> x ; x < 0 ); cin >> x; cout << “x must be >=0”; (3) int x; do{ cin >> x; if(x < 0) cout << “x must be >=0”; } (4) int x; cin >> x; while(x < 0){ cin >> x; cout << “x must be >=0”; } Choices: a. 2 and 4 b. 3 and 4 c. 2 and 3 d. 1 and 3
Types of Loop
Loops are the elements of programming in which a part of code is repeated a particular number of times. Loop executes the series of statements many times till the conditional statement becomes false.
Loops
Any task which is repeated more than one time is called a loop. Basically, loops can be divided into three types as while, do-while and for loop. There are so many programming languages like C, C++, JAVA, PYTHON, and many more where looping statements can be used for repetitive execution.
While Loop
Loop is a feature in the programming language. It helps us to execute a set of instructions regularly. The block of code executes until some conditions provided within that Loop are true.
C++
Which of the following is a correct way to ensure that once we read a nonnegative value into x, the loop will stop?
(1)
int x;
while(x < 0){
cin >> x;
if(x < 0)
cout << “x must be >=0”;
}
(2)
int x;
for(cin >> x ; x < 0 );
cin >> x;
cout << “x must be >=0”;
(3)
int x;
do{
cin >> x;
if(x < 0)
cout << “x must be >=0”;
}
(4)
int x;
cin >> x;
while(x < 0){
cin >> x;
cout << “x must be >=0”;
}
Choices:
a. 2 and 4
b. 3 and 4
c. 2 and 3
d. 1 and 3
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