Write a C program to accept the colour code for the colours of the rainbow and display its name. The program s

Solved Examples · Example 31

Q.Write a C program to accept the colour code for the colours of the rainbow and display its name. The program should be repeatedly executed as long as user choice is 1. The textbook presents this worked program, transcribed exactly as printed (including its printed errors): #include <stdio.h> void main() { int colour_code, choice; do { printf("Enter the colour code\n"); scanf("%d", &colour_code); switch(colour_code) { Case 1: printf("colour; Violet\n"); break ; Case 2: printf("colour; Indigo\n"); break ; Case 3: printf("colour; Blue\n"); break ; Case 4: printf("colour; Green\n"); break ; Case 5: printf("colour; Yellow\n"); break ; Case 6: printf("colour; Orange\n"); break ; Case 7: printf("colour; Red\n"); break ; default : printf("It is not colour of a rainbow\n"); } /*End of switch */ printf("press 0 or 1\n"); scanf("%d", &choice); } while (choice==1); } /*End of main()*/ Sample output printed in the textbook: Enter the colour code 4 Colour : Green Press 0 or 1 1 Enter the colour code 2 Colour : Indigo Press 0 or 1 0

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Concept understanding — Loop and Jump Control Statements (while, do-while, for, break, continue)

Loop (iterative) control statements repeat a block of statements as long as a condition holds, which lets a program perform a task many times without rewriting it. C provides three loops.

while loop - an entry-controlled loop: the condition is tested first, so the body may run zero times.
```
while (condition)
{ ... }
```
do-while loop - an exit-controlled loop: the body runs once first and the condition is tested afterwards, so it always executes at least once.
```
do
{ ... }
while (condition);
```
for loop - a compact loop that gathers the initialisation, test and update in one line: for (i=1; i<=n; i++). It is the natural choice when the number of repetitions is known.

Loops are used to add a series of numbers, print a name a fixed number of times, or process a menu repeatedly.

Jump statements change this normal flow from inside a loop: …

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[!TLDR]

A switch inside a do-while reports a rainbow colour by its code and repeats while the user enters 1; 4 -> Green, 2 -> Indigo.

Here a switch (multi-way selection on the code) is nested inside a do-while (a menu that repeats). The post-test do-while guarantees the menu is shown at least once, and the trailing prompt reads a continue flag: while choice == 1 the loop runs again, otherwise it ends. The default label catches any code outside 1-7. …

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