new file: Chapter_4/02_Loop_Types.c

new file: Chapter_4/03_While_Loop.c	new file: Chapter_4/Quick_Quiz/Quick_Quiz.c	new file: Chapter_4/Quick_Quiz/Solution.c

Author: VickyRohilla862

Chapter_4/02_Loop_Types.c

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+/*
+There are three types of loops
+ 1. While Loop
+ 2. Do-While Loop
+ 3. For Loop
+*/

Chapter_4/03_While_Loop.c

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+/*
+Syntax:
+ while(condition){
+ //code that runs in loop until the condition becomes false.
+ }
+
+The while loop keeps executing as long as the condition is true.
+*/
+//Lets take the example of printing "Happy Birthday" 100 times:
+// #include <stdio.h>
+// int main(){
+// int i = 0; // we will use this variable for condition
+// while(i<100){ // until the variable i stores value less than 100, the code inside while loop will execute in series
+// printf("Happy Birthday\n");
+// i = i+1; // increases the value of i by 1 each time the loop executes
+// }
+// return 0;
+// }
+
+/*
+Here we increase the value of i (0) by 1 each time the loop executes, so that at a point of time i can become 100. And when it becomes 100, the loop executes because the condition will become false
+
+This loop is mainly useful when we don't know how many times we want to execute the code.
+*/
+
+/*
+Note:
+ If the condition becomes false, the while loop keeps getting executed. Such loop is called an infinite loop.
+*/
+
+//example of an infinite loop is:
+
+// #include <stdio.h>
+// int main(){
+// int i = 0;
+// while(i<10){
+// printf("Value of i: %d", i);
+// }
+// return 0;
+// }
+// Here if we don't increase the value of i by 1, the condition (i<10) will always be true because 0 is less than 10 and it will never become false. so the loop will continue to loop that can create a lag in your system.
+
+// another example is:
+#include <stdio.h>
+int main(){
+ while(2<10){
+ printf("Happy Birthday\n");
+ }
+ return 0;
+}
+
+// this works same as the above example. The condition will always be true because 2 is less than 100. so the loop will continue to execute again creating lag in your system.

Chapter_4/Quick_Quiz/Quick_Quiz.c

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+// write a program to print natural numbers from 10-20 when initial loop counter is initialized to 0.
+// The loop counter needs not to be int, it can be a float also.

Chapter_4/Quick_Quiz/Solution.c

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+// answer 1
+// #include <stdio.h>
+// int main(){
+// int i = 0;
+// while(i<=20){
+// if(i>=10){
+// printf("%d\n", i);
+// }
+// i = i+1;
+// }
+// return 0;
+// }
+
+// answer 2
+#include <stdio.h>
+int main(){
+ int i = 0;
+ int nn = 10;
+ while(i <= 10){
+ printf("%d\n", nn);
+ nn = nn+1;
+ i = i+1;
+ }
+ return 0;
+}