I'm having a problem displaying the size of a string as an int.
It works fine using my IDE but doesn't compile using clang on Ubuntu.
Here's the code:
Code:#include <stdio.h> #include <string.h> int main() { char s1[ ] = "The grey fox"; char s2[ ] = "jumped"; strcat(s1, s2); printf("%s\n", s1); printf("Length of s1 is %d\n", strlen(s1)); strcpy(s1, s2); printf("s1 is now %s\n", s1); return 0; }
Last edited by code9dan; 09-11-2018 at 04:35 PM.
This is a serious mistake:
You declared s1 to be an array of char with size enough to store the string "The grey fox", and initialised it with that string literal. That's great, except that that means that there's no space to append anything else to it, but that's what you're trying to do with the strcat call.Code:char s1[ ] = "The grey fox"; char s2[ ] = "jumped"; strcat(s1, s2);
One way to fix this is to explicitly declare s1 to be large enough to store the final string you have in mind.
Look up a C++ Reference and learn How To Ask Questions The Smart WayOriginally Posted by Bjarne Stroustrup (2000-10-14)
@laserlight Thanks for response. I think a lot of the issues I face is because the tutorial app i'm using on my iPhone is out of date. I've had problems with put, get, strlen and others. I want to use linux and maybe a lot of this programs are made for visual basic c#.
I use a tutorial app called Sololearn.
I've looked through the help on this site and the books are so expensive. Can anyone can point me in the right direction for a cheap book or website or even another app that's better.
P.S. With a extensive search I worked it out.
Code:#include <stdio.h> #include <string.h> int main() { char s1[ ] = "The grey fox"; char s2[ ] = " jumped."; int len; strcat(s1, s2); printf("%s\n", s1); len = strlen(s1); printf("Length of s1 is %d\n", len); strcpy(s1, s2); printf("s1 is now %s\n", s1); return 0; }
Code:printf("Length of s1 is %lu\n", strlen(s1));
Code:char s1[21] = "The grey fox";
For a reference, there is this wiki, which is available in Ubuntu as devhelp ( apt install cppreference-doc-en-html ) or QT help ( apt install cppreference-doc-en-qch ). For a tutorial, Steve Summit's notes.
