（精选）凯撒密码程序Word版

1、#include<stdio.h>#include<conio.h> 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>=

2、9;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&#

3、39;) 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'&&

4、amp;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

5、)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

6、<='z') for(i=0;i<n;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<n;i+) k=(ch-'0')+i*10)%n; if(k=0) h=(ch-'0')+i*10)/n; if(h>

7、=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.Quitn");printf("=n&

8、quot;);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 infile20,outfile20;sleep(3);menu();ch0=getch();while(ch0!='5') if(ch0='1') clrscr(); printf("nPlease input the infile:"); scanf(&qu

9、ot;%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:"); scanf(&qu

10、ot;%s",outfile); if(out=fopen(outfile,"w")=NULL) printf("Can not open the outfile!n"); printf("Press any key to exit!n"); fclose(in); getch(); exit(0); while(!feof(in) fputc(JFjiami(fgetc(in),n),out); printf("nJFjiami is over!n"); fclose(in); fclose(out);

11、 sleep(1); if(ch0='2') 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 ke

12、y:"); scanf("%d",&n); printf("Please input the outfile:"); scanf("%s",outfile); if(out=fopen(outfile,"w")=NULL) printf("Can not open the outfile!n"); printf("Press any key to exit!n"); fclose(in); getch(); exit(0); while(!feof(in)

13、fputc(CFjiami(fgetc(in),n),out); printf("nCFjiami is over!n"); fclose(in); fclose(out); sleep(1); if(ch0='3') clrscr(); printf("nPlease input the infile:"); scanf("%s",infile); if(in=fopen(infile,"r")=NULL) printf("Can not open the infile!n")

14、; printf("Press any key to exit!n"); getch(); exit(0); printf("Please input the key:"); scanf("%d",&n); printf("Please input the outfile:"); scanf("%s",outfile); if(out=fopen(outfile,"w")=NULL) printf("Can not open the outfile!n&qu

15、ot;); printf("Press any key to exit!n"); fclose(in); getch(); exit(0); while(!feof(in) fputc(JFjiemi(fgetc(in),n),out); printf("nJFjiemi is over!n"); fclose(in); fclose(out); sleep(1); if(ch0='4') clrscr(); printf("nPlease input the infile:"); scanf("%s&quo

16、t;,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:"); scanf("%s",outfile); if(out=fopen(outfile,"w")=NULL) printf("Can not open the outfile!n"); printf("Press any key to exit!n&