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  1. #include <stdio.h>
  2. #include <stdlib.h>
  3.  
  4. #define MAXLEN (50+1)
  5.  
  6. int cypher(char source[], char destination[],int key)	{
  7. 	int i;
  8. 	char e;
  9. 	for(i = 0; source[i] != '\0' && i <= MAXLEN; i++)	{
  10. 		if(source[i] == ' ')	putchar(source[i]);
  11. 		e = ((source[i] - 32) + key) % 26;
  12. 		if(e > 94)	{
  13. 			e -= 93;
  14. 		}
  15. 		destination[i] = e + 32;
  16. 	}
  17. 	destination[i] = '\0';
  18. 	return 0;
  19. }
  20.  
  21.  
  22. int main(void)	{
  23. 	char source[MAXLEN], destination[MAXLEN];
  24. 	int key;
  25. 	printf("Enter text to encrypt: ");
  26. 	scanf("%s",source);
  27. 	printf("Enter encryption key: ");
  28. 	scanf("%d",&key);
  29. 	cypher(source,destination,key);
  30. 	printf("Source:\n %s\nEncrypted:\n %s\n",source,destination);
  31. 	return 0;
  32. }
  33.  
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https://ideone.com/FPUnS
language:
C (gcc 8.3)
created:
13 years ago
visibility:
public

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