How to write encryption function in C

Question

Program take a text and n value. Add this n value each character. (Don’t add n numeric characters).

For exemple:

n=1

input:

akm101

output:

bln101

I have tried this but didn't execute.

while( letter != EOF ){
    fscanf(inp, "%c", &letter);
    if(47 < letter && letter < 58)
        printf("%c",letter);
    else 
        printf("%c", letter+n);
}

You must have mistaken SO for a site where other people do your homework. — m0skit0, Oct 14 '14 at 20:47
@CyberTR post something that actually compiles. And explain what you're having trouble understanding. — DaV, Oct 14 '14 at 20:58

score 0 · Accepted Answer · edited May 23 '17 at 12:20

0

Since this is probably homework, where the objective is learning rather than producing a correct answer, I'll offer some guidance.

Loop through each character in the string.
If the character is a letter, increment the value of the character at that position by one
Output the result of this loop.

http://www.asciitable.com/

edited May 23 '17 at 12:20

Community

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answered Oct 14 '14 at 20:50

Eric J.

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Thanks but how i add increment value please look at my tried function. What is my mistake? – CyberTR Oct 14 '14 at 20:51
printing infinity space character – CyberTR Oct 14 '14 at 21:13
@CyberTR: `letter` must be an `int`, not a `char`. – indiv Oct 14 '14 at 21:39

How to write encryption function in C

1 Answers1