My assignment is to have the user input a filename and then change that filename to all capital letters. I have no clue how to do this. Any help would be greatly appreciated. I will post the code I have so far but I have no idea where to go from here
PHP Code:#include <stdio.h>
int main()
{
FILE *infile;
char filename[13];
printf("\nEnter a file name: ");
gets(filename);
infile = fopen(filename,"w");
gets is bad news.
So first fix that. Then it's simply a matter of turning filename to uppercase using toUpper. Then you want to open filename in read mode, and FILENAME in write mode. Then you copy the file over.
Teacher: "You connect with Internet Explorer, but what is your browser? You know, Yahoo, Webcrawler...?" It's great to see the educational system moving in the right direction
Try this:
Code:#include <stdio.h> #include <ctype.h> #define MAX 13 int main() { int i; char old[MAX], new[MAX]; printf("\nEnter a file name: "); fgets(old, MAX, stdin); for (i=0; old[i]!='\n'&&old[i]!='\0'; i++) new[i]=toupper(old[i]); old[i]=new[i]='\0'; /*Attempt to rename*/ if (rename( old, new )==0) printf( "File '%s' renamed to '%s'\n", old, new ); else printf( "Failed to rename '%s'\n", old ); return 0; }
Is fgets an appropriate substitute? My textbook constantly uses gets but everyone on this website seems to despise it.
Here is my new rough draft. It won't compile due to the toupper line so not sure where I am going wrong on that one. Thanks for your help.
Kevin
Code:#include <stdio.h> #include <ctype.h> int main() { FILE *infile; char filename[13]; char FILENAME[13]; printf("\nEnter a file name: "); gets(filename); infile = fopen(filename,"w"); toupper filename = FILENAME; printf("\nFilename is now %s",FILENAME); return 0; }
Read the link. gets is bad news. fgets is a good substitute. And toUpper is function that takes a character and returns anoter....I don't really know what you're doing...
After that, you should google "man rename". While you're at it, google "man toUpper".
Teacher: "You connect with Internet Explorer, but what is your browser? You know, Yahoo, Webcrawler...?" It's great to see the educational system moving in the right direction
toupper() takes a character and gives the character back, in uppercase. So you loop through the filename, changing each character to uppercase. I hope you've learned loops and function calls by now...
Code:#include <stdio.h> void J(char*a){int f,i=0,c='1';for(;a[i]!='0';++i)if(i==81){ puts(a);return;}for(;c<='9';++c){for(f=0;f<9;++f)if(a[i-i%27+i%9 /3*3+f/3*9+f%3]==c||a[i%9+f*9]==c||a[i-i%9+f]==c)goto e;a[i]=c;J(a);a[i] ='0';e:;}}int main(int c,char**v){int t=0;if(c>1){for(;v[1][ t];++t);if(t==81){J(v[1]);return 0;}}puts("sudoku [0-9]{81}");return 1;}
> My textbook constantly uses gets but everyone on this website seems to despise it.
Take it back to the shop for a refund
Set fire to it
Use it to prop up a wobbly table.
Do anything except continue to learn C from it.
If you dance barefoot on the broken glass of undefined behaviour, you've got to expect the occasional cut.
If at first you don't succeed, try writing your phone number on the exam paper.
Make a paper juice out of it and give it to a drunkOriginally Posted by Salem
Make the pages your scrap papers
Play frisbee with your dog using that book
