C language 1-100 Plus, for Prime, count the Swiss-year detection letter case, login system

Source: Internet
Author: User

#include <stdio.h>

void Test () {//1+2+3+4+.....+100

int A, B;

a=0;

b=0;

for (; a<=100; a++) {

B=b+a;

printf ("%d\n", b);

}

}

void Test1 () {//Enter a number to see if it is prime

int C;

printf ("Please enter a number greater than 10:");

scanf ("%d", &c);

printf ("In checking,wait a minuts.please\n");

if (c%2!=0&&c%3!=0&&c%5!=0&&c%7!=0)

printf ("%d is prime number \ n", c);

else printf ("%d is not prime", c);

}

/* Find Prime easier

#include <stdio.h>

#include <math.h>

int main ()

{int n,i,k;

printf ("Please enter a integer number:n=?");

scanf ("%d", &n);

K=SQR (n);

for (i=2;i<=k;i++)

if (n%i==0) break;

if (i<=k) printf ("%d is not a prime number.\n");

return 0;

}

*/

void Test2 () {//To print prime numbers within 8~100

int d=8;

while (d<100) {

if (d%2!=0&&d%3!=0&&d%5!=0&&d%7!=0)

printf ("%d is prime number \ n", d);

printf ("%d is not prime", d);

d++;

}

printf ("\ n");

}

void Test3 () {//Enter a year to see if Nadia

int e;

printf ("Please enter the year to be detected:");

scanf ("%d", &e);

printf ("in checking,wait,please...\n");

if (e%100==0) {//if

if (e%400==0)

printf ("%d year is Swiss year \ n", e);

else printf ("%d year is not Swiss year \ n", e);

}

else if (e%4==0)

printf ("%d year is Swiss year \ n", e);

else printf ("%d year is not Swiss year \ n", e);

}

void Test4 () {//Enter a letter at random to determine whether the letter is uppercase or lowercase and outputs the corresponding uppercase or lowercase letters

Char F;

printf ("Please enter a letter \ n");

F=getchar ();

scanf ("%c", &f);

printf ("wait\n");

while (f!= ' \ n ') {

if (f>= ' a ' &&f<= ' Z ') {

printf ("%c is a lowercase letter \ n", f);

printf ("The capital letter of%c is%c\n", f,f-32);

}

if (f>= ' A ' &&f<= ' Z ') {

printf ("%c is capital letter \ n", f);

printf ("The lowercase letter of%c is%c\n", f,f+32);

}

}

}

/* Uppercase and lowercase

printf ("%d-%d-%d-%d", ' a ', ' Z ', ' a ', ' Z ');//output corresponding ASIC code

if (a>=97&&a<=122) {

printf ("TA is a lowercase letter, corresponding to uppercase:%c", a-32)

}

else If ...

*/

void Test5 () {//Login system

int g,h,i,j;

I=1;

J=1;

printf ("Please enter user name:");

scanf ("%d", &g);

printf ("Please enter password:");

scanf ("%d", &h);

if (G==I&&H==J)

printf ("dengluchenggong\n");

else printf ("denglushibai\n");

}

/* Login program and can run repeatedly.

int name=0,pass=0;

int c_name=123,c_pass=456;

while (1) {

printf ("qingshuruyonghuming:\n");

scanf ("%d", &name);

printf ("qingshurumima:\n");

scanf ("%d", &pass);

if (! ( Name==c_name&&pass==c_pass)) {

printf ("Incorrect input information \ n");

}

Else{break;}

}printf ("Landing success");

*/

int main (int argc, const char * argv[]) {

Insert code here ...

printf ("Hello, world!\n");

Test ();

Test1 ();

Test2 ();

Test3 ();

Test4 ();//can run independently

Test5 ();

return 0;

}

C language 1-100 Plus, for Prime, count the Swiss-year detection letter case, login system

Related Article

Contact Us

The content source of this page is from Internet, which doesn't represent Alibaba Cloud's opinion; products and services mentioned on that page don't have any relationship with Alibaba Cloud. If the content of the page makes you feel confusing, please write us an email, we will handle the problem within 5 days after receiving your email.

If you find any instances of plagiarism from the community, please send an email to: info-contact@alibabacloud.com and provide relevant evidence. A staff member will contact you within 5 working days.

A Free Trial That Lets You Build Big!

Start building with 50+ products and up to 12 months usage for Elastic Compute Service

  • Sales Support

    1 on 1 presale consultation

  • After-Sales Support

    24/7 Technical Support 6 Free Tickets per Quarter Faster Response

  • Alibaba Cloud offers highly flexible support services tailored to meet your exact needs.