#include<stdio.h> char monocipher_encr(char); char alpha[27][3]={ {'a','f'}, {'b','a'}, {'c','g'}, {'d','u'}, {'e','n'}, {'f','i'}, {'g','j'}, {'h','k'}, {'i','l'}, {'j','m'}, {'k','o'}, {'l','p'}, {'m','q'}, {'n','r'}, {'o','s'}, {'p','t'}, {'q','v'}, {'r','w'}, {'s','x'}, {'t','y'}, {'u','z'}, {'v','b'}, {'w','c'}, {'x','d'}, {'y','e'}, {'z','h'} }; char str[20]; int main() { char str[20],str2[20]; int i; printf("\n Enter String.."); gets(str); for(i=0;str[i];i++) str2[i]=monocipher_encr(str[i]); printf("\n Before Decryption..%s",str); printf("\n After Decryption..%s\n",str2); } char monocipher_encr(char a) { int i; for(i=0;i<27;i++) { if(a == alpha[i][0]) break; } return alpha[i][1]; }
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