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

#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