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# include <stdio.h>
# include <math.h>
#include <stdlib.h>
#include <unistd.h>
# include <string.h>
int main(int argc,char *argv[])
{
int i=0;
char *text;
int taille,t ;
int j=0;
int tab1[strlen(text)];
int tab2[strlen(argv[1])];
char s[7];
int taille_m;
char car[2]={' ',' '};
char mot[2];
char table[26];
table[0]='A' ;
table[1]='B' ;
table[2]='C' ;
table[3]='D' ;
table[4]='E' ;
table[5]='F' ;
table[6]='G' ;
table[7]='H' ;
table[8]='I' ;
table[9]='J' ;
table[10]='K' ;
table[11]='L' ;
table[12]='M' ;
table[13]='N' ;
table[14]='O' ;
table[15]='P' ;
table[16]='Q' ;
table[17]='R' ;
table[18]='S' ;
table[19]='T' ;
table[20]='U' ;
table[21]='V' ;
table[22]='W' ;
table[23]='X' ;
table[24]='Y' ;
table[25]='Z' ;
printf("entrez le texte\n");
scanf("%s",text);
printf("%s",text);
//s="bnsp";
taille=strlen(text);
printf("%d\n",taille);
// strcpy(car," \0");
//car[0]=" ";
car[1]='\0';
strcpy(mot,"aa");
strcpy(s," ");
printf( "bonjour");
// I retrieves the index of each character in the text that corresponds to the letter of the table
for (i=0;i<=taille;i++)
{
while ((j<taille)&&(text[i]!=table[j]))
{
j++;
}
if (text[i]==table[j])
{
tab1[i]=j;
}
else
if (j>taille)
{
tab1[i]=100;
}
}
// I retrieves the index of each character of the key that corresponds to the letter of the table
t=strlen(argv[1]);
printf("%d\n",t);
j=0;
for (i=0;i<=t;i++)
{
while ((j<t)&&(text[i]!=argv[1][i]))
{
j++;
}
if (argv[1][i]!=table[j])
{
tab2[i]=j;
}
}
//
for (i=0;i<=taille;i++)
{
if (tab1[i]!=100)
{
if (i<t)
{
if ((tab1[i]+tab2[i])<26)
{
strcpy(s,mot);
car[0]=table[tab1[i]+tab2[i]];
printf("%c\n",car[0]);
strcat(s,s);
printf("%s\n",s);
}
else
{
strcpy(s,mot);
car[0]=table[tab1[i]+tab2[i]-26];
strcat(s,s);
printf("%s\n",s);
}
}
else
{
if ((tab1[i]+tab2[i-t])<26)
{
strcpy(s,mot);
car[0]=table[tab1[i]+tab2[i]];
strcat(s,s);
printf("%s\n",s);
}
else
{
strcpy(s,mot);
car[0]=table[tab1[i]+tab2[i-t]-26];
strcat(s,s);
printf("%s\n",s);
}
}
}
else
{
strcpy(s,mot);
car[0]=text[i];
strcat(s,s);
}
}
printf("ciphertext\n");
printf("%s\n",s);
return 0;
} |
