#include #include int encrypt(void); int decrypt(void); int encrypt_view(void); int decrypt_view(void); FILE *fp1, *fp2; char ch; int main() { int choice; while(1) { printf(\"Select One of the Following:\ \"); printf(\"\ 1. Encrypt\ \"); printf(\"2. Decrypt\ \"); printf(\"3. View The Encypted File\ \"); printf(\"4. View The Decrypted File\ \"); printf(\"5. Exit\ \"); printf(\"\ Enter Your Choice:\\t\"); scanf(\"%d\", &choice); switch(choice) { case 1: encrypt(); break; case 2: decrypt(); break; case 3: encrypt_view(); break; case 4: decrypt_view(); break; case 5: exit(1); } } printf(\"\ \"); return 0; } int encrypt() { printf(\"\ \"); fp1 = fopen(\"/home/tusharsoni/Desktop/Source\",\"r\"); if(fp1 == NULL) { printf(\"Source File Could Not Be Found\ \"); } fp2 = fopen(\"/home/tusharsoni/Desktop/Target\",\"w\"); if(fp2 == NULL) { printf(\"Target File Could Not Be Found\ \"); } while(1) { ch = fgetc(fp1); if(ch == EOF) { printf(\"\ End Of File\ \"); break; } else { ch = ch - (8 * 5 - 3); fputc(ch, fp2); } } fclose(fp1); fclose(fp2); printf(\"\ \"); return 0; } int decrypt() { printf(\"\ \"); fp1 = fopen(\"/home/tusharsoni/Desktop/Target\",\"r\"); if(fp1 == NULL) { printf(\"Source File Could Not Be Found\ \"); } fp2 = fopen(\"/home/tusharsoni/Desktop/Source\",\"w\"); if(fp2 == NULL) { printf(\"Target File Could Not Be Found\ \"); } while(1) { ch = fgetc(fp1); if(ch == EOF) { printf(\"\ End Of File\ \"); break; } else { ch = ch + (8 * 5 - 3); fputc(ch, fp2); } } fclose(fp1); fclose(fp2); printf(\"\ \"); return 0; } int encrypt_view() { printf(\"\ \"); fp1 = fopen(\"/home/tusharsoni/Desktop/Target\",\"r\"); if(fp1 == NULL) { printf(\"No File Found\ \"); exit(1); } else { while(1) { ch = fgetc(fp1); if(ch == EOF) { break; } else { printf(\"%c\", ch); } } printf(\"\ \"); fclose(fp1); } printf(\"\ \"); return 0; } int decrypt_view() { printf(\"\ \"); fp1 = fopen(\"/home/tusharsoni/Desktop/Source\",\"r\"); if(fp1 == NULL) { printf(\"No File Found\ \"); exit(1); } else { while(1) { ch = fgetc(fp1); if(ch == EOF) { break; } else { printf(\"%c\", ch); } } printf(\"\ \"); fclose(fp1); } return 0; printf(\"\ \"); } Solution #include #include int encrypt(void); int decrypt(void); int encrypt_view(void); int decrypt_view(void); FILE *fp1, *fp2; char ch; int main() { int choice; while(1) { printf(\"Select One of the Following:\ \"); printf(\"\ 1. Encrypt\ \"); printf(\"2. Decrypt\ \"); printf(\"3. View The Encypted File\ \"); printf(\"4. View The Decrypted File\ \"); printf(\"5. Exit\ \"); printf(\"\ Enter Your Choice:\\t\"); scanf(\"%d\", &choice); switch(choice) { case 1: encrypt(); break; case 2: decrypt(); break; case 3: encrypt_view(); break; case 4: decrypt_view(); break; case 5: exit(1); } } printf(\"\ \"); return 0; } int encrypt() { printf(\"\ \"); fp1 = fopen(\"/home/tusharsoni/Desktop/Source\",\"r\"); if(fp1 == NULL) { printf(\"Source File Could Not Be Found\ \"); } fp2 = fopen(\"/home/tusharsoni/Desktop/Target\",\"w\"); if(fp2 == NULL) { printf(\"Ta.

1. #include
#include
int encrypt(void);
int decrypt(void);
int encrypt_view(void);
int decrypt_view(void);
FILE *fp1, *fp2;
char ch;
int main()
{
int choice;
while(1)
{
printf("Select One of the Following: ");
printf(" 1. Encrypt ");
printf("2. Decrypt ");
printf("3. View The Encypted File ");
printf("4. View The Decrypted File ");
printf("5. Exit ");
printf(" Enter Your Choice:t");
scanf("%d", &choice);
switch(choice)
{
case 1: encrypt();
break;
case 2: decrypt();
break;
case 3: encrypt_view();
break;
case 4: decrypt_view();
break;
case 5: exit(1);
}
}
printf(" ");

2. return 0;
}
int encrypt()
{
printf(" ");
fp1 = fopen("/home/tusharsoni/Desktop/Source","r");
if(fp1 == NULL)
{
printf("Source File Could Not Be Found ");
}
fp2 = fopen("/home/tusharsoni/Desktop/Target","w");
if(fp2 == NULL)
{
printf("Target File Could Not Be Found ");
}
while(1)
{
ch = fgetc(fp1);
if(ch == EOF)
{
printf(" End Of File ");
break;
}
else
{
ch = ch - (8 * 5 - 3);
fputc(ch, fp2);
}
}
fclose(fp1);
fclose(fp2);
printf(" ");
return 0;
}
int decrypt()
{

3. printf(" ");
fp1 = fopen("/home/tusharsoni/Desktop/Target","r");
if(fp1 == NULL)
{
printf("Source File Could Not Be Found ");
}
fp2 = fopen("/home/tusharsoni/Desktop/Source","w");
if(fp2 == NULL)
{
printf("Target File Could Not Be Found ");
}
while(1)
{
ch = fgetc(fp1);
if(ch == EOF)
{
printf(" End Of File ");
break;
}
else
{
ch = ch + (8 * 5 - 3);
fputc(ch, fp2);
}
}
fclose(fp1);
fclose(fp2);
printf(" ");
return 0;
}
int encrypt_view()
{
printf(" ");
fp1 = fopen("/home/tusharsoni/Desktop/Target","r");
if(fp1 == NULL)
{

4. printf("No File Found ");
exit(1);
}
else
{
while(1)
{
ch = fgetc(fp1);
if(ch == EOF)
{
break;
}
else
{
printf("%c", ch);
}
}
printf(" ");
fclose(fp1);
}
printf(" ");
return 0;
}
int decrypt_view()
{
printf(" ");
fp1 = fopen("/home/tusharsoni/Desktop/Source","r");
if(fp1 == NULL)
{
printf("No File Found ");
exit(1);
}
else
{
while(1)
{

5. ch = fgetc(fp1);
if(ch == EOF)
{
break;
}
else
{
printf("%c", ch);
}
}
printf(" ");
fclose(fp1);
}
return 0;
printf(" ");
}
Solution
#include
#include
int encrypt(void);
int decrypt(void);
int encrypt_view(void);
int decrypt_view(void);
FILE *fp1, *fp2;
char ch;
int main()
{
int choice;
while(1)
{
printf("Select One of the Following: ");
printf(" 1. Encrypt ");
printf("2. Decrypt ");
printf("3. View The Encypted File ");

6. printf("4. View The Decrypted File ");
printf("5. Exit ");
printf(" Enter Your Choice:t");
scanf("%d", &choice);
switch(choice)
{
case 1: encrypt();
break;
case 2: decrypt();
break;
case 3: encrypt_view();
break;
case 4: decrypt_view();
break;
case 5: exit(1);
}
}
printf(" ");
return 0;
}
int encrypt()
{
printf(" ");
fp1 = fopen("/home/tusharsoni/Desktop/Source","r");
if(fp1 == NULL)
{
printf("Source File Could Not Be Found ");
}
fp2 = fopen("/home/tusharsoni/Desktop/Target","w");
if(fp2 == NULL)
{
printf("Target File Could Not Be Found ");
}
while(1)
{
ch = fgetc(fp1);

7. if(ch == EOF)
{
printf(" End Of File ");
break;
}
else
{
ch = ch - (8 * 5 - 3);
fputc(ch, fp2);
}
}
fclose(fp1);
fclose(fp2);
printf(" ");
return 0;
}
int decrypt()
{
printf(" ");
fp1 = fopen("/home/tusharsoni/Desktop/Target","r");
if(fp1 == NULL)
{
printf("Source File Could Not Be Found ");
}
fp2 = fopen("/home/tusharsoni/Desktop/Source","w");
if(fp2 == NULL)
{
printf("Target File Could Not Be Found ");
}
while(1)
{
ch = fgetc(fp1);
if(ch == EOF)
{
printf(" End Of File ");
break;

8. }
else
{
ch = ch + (8 * 5 - 3);
fputc(ch, fp2);
}
}
fclose(fp1);
fclose(fp2);
printf(" ");
return 0;
}
int encrypt_view()
{
printf(" ");
fp1 = fopen("/home/tusharsoni/Desktop/Target","r");
if(fp1 == NULL)
{
printf("No File Found ");
exit(1);
}
else
{
while(1)
{
ch = fgetc(fp1);
if(ch == EOF)
{
break;
}
else
{
printf("%c", ch);
}
}
printf(" ");

9. fclose(fp1);
}
printf(" ");
return 0;
}
int decrypt_view()
{
printf(" ");
fp1 = fopen("/home/tusharsoni/Desktop/Source","r");
if(fp1 == NULL)
{
printf("No File Found ");
exit(1);
}
else
{
while(1)
{
ch = fgetc(fp1);
if(ch == EOF)
{
break;
}
else
{
printf("%c", ch);
}
}
printf(" ");
fclose(fp1);
}
return 0;
printf(" ");
}