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  1. #include <stdio.h>
  2. int main()
  3. {
  4.     char str[100];
  5.     int key, i=0, left;
  6.     printf("Enter your plain text : ");
  7.     scanf("%[^\n]s",str);
  8.     printf("Enter the key : ");
  9.     scanf("%d",&key);
  10.     if(key==0)
  11.     {
  12.         printf("INVALID INPUT");
  13.     }
  14.     else
  15.     {
  16.         while(str[i]!='\0')
  17.         {
  18.             //printf("%d\n", str[i]);
  19.             if(str[i]>=48 && str[i]<=57)
  20.             {
  21.                 if(str[i]+key<=57)
  22.                 {
  23.                     str[i] = str[i] + key;
  24.                 }
  25.                 else
  26.                 {
  27.                     left = (str[i] + key) - 57;
  28.                     str[i] = 47 + left;
  29.                 }   
  30.             }
  31.             else if(str[i]>=65 && str[i]<=90)
  32.             {
  33.                 if(str[i]+key<=90)
  34.                 {
  35.                     str[i] = str[i] + key;
  36.                 }
  37.                 else
  38.                 {
  39.                     left = (str[i] + key) - 90;
  40.                     str[i] = 64 + left;
  41.                 }  
  42.             }
  43.             else if(str[i]>=97 && str[i]<=122)
  44.             {
  45.                 if(str[i]+key<=122)
  46.                 {
  47.                     str[i] = str[i] + key;
  48.                 }
  49.                 else
  50.                 {
  51.                     left = (str[i] + key) - 122;
  52.                     str[i] = 96 + left;
  53.                 } 
  54.             }
  55.             i++;
  56.         }
  57.         printf("The encrypted text is : %s",str);
  58.    }
  59.    return 0;
  60. }
Success #stdin #stdout 0s 4676KB
comments (?)
stdin
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Standard input is empty
stdout
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Enter your plain text : Enter the key : INVALID INPUT
https://ideone.com/Gb121D
language:
C++14 (clang 8.0)
created:
3 years ago
visibility:
public

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