Cryptography-Code-Bunch/CaesarCipher.c at master · astrodestroyergithub/Cryptography-Code-Bunch · GitHub

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#include<stdio.h>
#include<string.h>

char* encpt(char encpt_txt[])
{
	int i, n;
	char ch;
	for(i=0;i<strlen(encpt_txt);i++)
	{
		n=encpt_txt[i];
		n=n+3;
		if(n>90)
		{
			n=n-90+64;
			ch=n;
			encpt_txt[i]=ch;
		}
		else
		{
			ch=n;
			encpt_txt[i]=ch;
		}
	}
	return encpt_txt;
}


char* decpt(char decpt_txt[])
{
	int i, n;
	char ch;
	for(i=0;i<strlen(decpt_txt);i++)
	{
		n=decpt_txt[i];
		n=n-3;
		if(n<65)
		{
			n=91-(65-n);
			ch=n;
			decpt_txt[i]=ch;
		}
		else
		{
			ch=n;
			decpt_txt[i]=ch;
		}
	}
	return decpt_txt;
}


int main()
{
	char input[500], encpt_txt[500], decpt_txt[500];

	printf("Enter the text to be sent: \n");
	scanf("%s", &input);

	strcpy(encpt_txt,encpt(input));
	printf("\nThe encrypted text is: \n");
	printf("%s",encpt_txt);

	strcpy(decpt_txt,decpt(encpt_txt));
	printf("\n\nThe decrypted text is: \n");
	printf("%s",decpt_txt);

	return 0;
}