Shulou(Shulou.com)06/01 Report--

This article mainly introduces "how to use do-while statement in C language". In daily operation, I believe many people have doubts about how to use do-while statement in C language. Xiaobian consulted various materials and sorted out simple and easy operation methods. I hope to help you answer the doubts of "how to use do-while statement in C language"! Next, please follow the small series to learn together!

While loops and for loops are both entry conditional loops, i.e. test conditions are checked before each iteration of the loop, so it is possible not to execute the contents of the loop body at all. C also has exit-condition loops, which check test conditions after each iteration of the loop, which ensures that the contents of the loop body are executed at least once. This loop is called a do while loop.

Consider the following example:

#include int main(void) { const int secret_code = 13; int code_entered; do { printf("To enter the triskaidekaphobia therapy club,\n"); printf("please enter the secret code number: "); scanf("%d", &code_entered); } while (code_entered != secret_code); printf("Congratulations! You are cured!\ n"); return 0; }

Run Results:

To enter the triskaidekaphobia therapy club,

please enter the secret code number: 12

To enter the triskaidekaphobia therapy club,

please enter the secret code number: 14

To enter the triskaidekaphobia therapy club,

please enter the secret code number: 13

Congratulations! You are cured!

An equivalent program can also be written using the while loop, but longer, as shown in Listing 6.16.

#include int main(void) { const int secret_code = 13; int code_entered; printf("To enter the triskaidekaphobia therapy club,\n"); printf("please enter the secret code number: "); scanf("%d", &code_entered); while (code_entered != secret_code) { printf("To enter the triskaidekaphobia therapy club,\n"); printf("please enter the secret code number: "); scanf("%d", &code_entered); } printf("Congratulations! You are cured!\ n"); return 0; }

Here is the general form of the do while loop:

do statement while ( expression );

A statement can be a simple statement or a compound statement. Note that do-while loops end with semicolons.

Structure of a =do while= loop=do-while loop executes the test condition after the loop body, so it executes the loop body at least once; for loop or while loop executes the test condition before the loop body. Do while loops apply to loops that iterate at least once. For example, here is pseudocode for a cryptographic program that contains a do while loop:

do { prompt for password read user input } while (input not equal to password);

Avoid this form of do-while construct:

do { ask user if he or she wants to continue some clever stuff } while (answer is yes);

This structure causes the user to answer "no" and still perform the "other behaviors" section because the test condition is executed late.

At this point, the study of "how to use do-while statements in C language" is over, hoping to solve everyone's doubts. Theory and practice can better match to help everyone learn, go and try it! If you want to continue learning more relevant knowledge, please continue to pay attention to the website, Xiaobian will continue to strive to bring more practical articles for everyone!

Welcome to subscribe "Shulou Technology Information " to get latest news, interesting things and hot topics in the IT industry, and controls the hottest and latest Internet news, technology news and IT industry trends.