凯撒密码程序
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凯撒密码程序#include
#include
char JFjiami(char ch,int n) {
while(ch>='A'&&ch<='Z') {
n=n%26;
return ('A'+(ch-'A'+n)%26); }
while(ch>='a'&&ch<='z') {
n=n%26;
return ('a'+(ch-'a'+n)%26); }
while(ch>='0'&&ch<='9') {
n=n%10;
return ('0'+(ch-'0'+n)%10); }
return ch;
}
char JFjiemi(char ch,int n) {
static int k;
while(ch>='A'&&ch<='Z') { k=n%26;
n=26-k;
return ('A'+(ch-'A'+n)%26); }
while(ch>='a'&&ch<='z') { k=n%26;
n=26-k;
return ('a'+(ch-'a'+n)%26); }
while(ch>='0'&&ch<='9') { k=n%10; n=10-k;
return ('0'+(ch-'0'+n)%10); } return ch;
}
char CFjiami(char ch,int n) {
if(n%2==0) n=n%10+1;
else n=n%10;
if(n%5==0) n=n+2;
else n=n;
while(ch>='A'&&ch<='Z') {
return ('A'+((ch-'A')*n)%26);
}
while(ch>='a'&&ch<='z') {
return ('a'+((ch-'a')*n)%26);
}
while(ch>='0'&&ch<='9') {
return ('0'+((ch-'0')*n)%10);
}
return ch;
}
char CFjiemi(char ch,int n) {
int i;
int k,h;
if(n%2==0) n=n%10+1; else n=n%10; if(n%5==0) n=n+2;
else n=n;
while(ch>='A'&&ch<='Z') {
for(i=0;i<100;i++)
{
k=((ch-'A')+i*26)%n;
if(k==0)
h=((ch-'A')+i*26)/n;
if(h>=0&&h<=26)
return ('A'+h);
}
}
while(ch>='a'&&ch<='z') {
for(i=0;i { k=((ch-'a')+i*26)%n; if(k==0) h=((ch-'a')+i*26)/n; if(h>=0&&h<=26) return ('a'+h); } } while(ch>='0'&&ch<='9') { for(i=0;i { k=((ch-'0')+i*10)%n; if(k==0) h=((ch-'0')+i*10)/n; if(h>=0&&h<=9) return ('0'+h); } } return ch; } void menu() { printf("\n=========================================================" ); printf("\n 1.JFjiami the file"); printf("\n 2.CFljiami the file"); printf("\n 3.JFjiemi the file"); printf("\n 4.CFjiemi the file"); printf("\n 5.Quit\n"); printf("=========================================================\n"); printf("Please input a number rang from 1 to 5 and select a item:"); return; } void main() { int i,n; char ch0,ch1; FILE *in,*out; char infile[20],outfile[20]; sleep(3); menu(); ch0=getch(); while(ch0!='5') { if(ch0=='1') { clrscr(); printf("\nPlease input the infile:"); scanf("%s",infile); if((in=fopen(infile,"r"))==NULL) { printf("Can not open the infile!\n"); printf("Press any key to exit!\n"); getch(); exit(0); } printf("Please input the key:"); scanf("%d",&n); printf("Please input the outfile:");