it's requested that a given string char input_str[5] = "Hello"; must be padded with leading character = 0. so the result will have a fixed length of 10 characters: out_put == "00000Hello".
any idea how to do so in C?
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Ezzedeen Saghier
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Padded where? In memory? When printing? In same string? In a different one? – Eugene Sh. May 30 '18 at 16:09
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2Using the `printf` function family you can 0 pad a string as well as an integer. Have a read of the man page. – Weather Vane May 30 '18 at 16:10
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You can use 0 padding but gcc warns that it leads to undefined behavior with `s`. – unxnut May 30 '18 at 16:12
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2Possible duplicate of [String Padding in C](https://stackoverflow.com/questions/276827/string-padding-in-c) – Emiliano May 30 '18 at 16:29
1 Answers
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here you are an example
int targetStrLen = 10; // Target output length
const char *myString="Hello"; // String for output
const char *padding="0000000000000000000000000000000000000000000000000000000000000";
int padLen = targetStrLen - strlen(myString); // Calc Padding length
if(padLen < 0) padLen = 0; // Avoid negative length
printf("[%*.*s%s]", padLen, padLen, padding, myString); // LEFT Padding
printf("[%s%*.*s]", myString, padLen, padLen, padding); // RIGHT Padding
If you have some doubt see this answer https://stackoverflow.com/a/9741091/3284537 where I extract the code
Emiliano
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2This should be a comment or probably a close-as-duplicate vote. – n. 'pronouns' m. May 30 '18 at 16:20
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2The user should have made his own attempt. No effort was shown. It does not help to spoon-feed people who ask "write my code for me". – Weather Vane May 30 '18 at 16:22
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I will do but copy paste the code seems to me worst than paste the link – Emiliano May 30 '18 at 19:06