Thanks adak, but it gives the same result as my effort previously. Is very frustrating. Yours does look nicer though!
I will muck around with your version now. maybe I missed something.
Thanks adak, but it gives the same result as my effort previously. Is very frustrating. Yours does look nicer though!
I will muck around with your version now. maybe I missed something.
OK, one more time!
Output:Code:#include <stdio.h> #include <string.h> int main() { char ch; char file[12] = {"TomB"}; char newfile[12] = {"\0"}; char ext[5] = {".txt"}; int i = 0, length, j; FILE *nf; printf("\n\n"); while(ch = file[i]) { newfile[0] = ch; strcat(newfile, ext); nf = fopen(newfile, "w"); printf("\n%s ", newfile); if (nf == NULL) { fprintf(stderr, "Can't open created file %s!\n", newfile); exit(1); } length = strlen(newfile); for(j = 0; j < length; j++) newfile[j] = '\0'; ++i; } j = getchar(); return 0; }
T.txt
o.txt
m.txt
B.txt
using strcat when you need to update only 1 char... too complicated
something like that should work I supposeCode:char mask[] = "TomB"; char name[] = "1.txt"; size_t len = strlen(mask); size_t i; for(i = 0; i< len; i++) { FILE* fp; name[0] = mask[i]; /* see - you just replace 1 char in the name */ fp = fopen (name, "w"); if(fp) { printf("File %s opened\n", name); fclose(fp); } }
All problems in computer science can be solved by another level of indirection,
except for the problem of too many layers of indirection.
– David J. Wheeler
Why not put the filename generating code into its own function, to simplify things?
Code:char* generate_filename( const char* template_name, int index, const char* extension, char* buffer, int maxlen ) { char digits[ 32 ]; sprintf( digits, "%d", index ); if( ( int )( strlen( template_name ) + strlen( digits ) + strlen( extension ) + 1 ) > maxlen ) return NULL; strcpy( buffer, template_name ); strcat( buffer, digits ); strcat( buffer, extension ); return buffer; } int main( void ) { char buffer[ 1024 ]; for( int i = 12; i < 20; i++ ) { if( generate_filename( "TomB", i, ".txt", buffer, 1024 ) ) { puts( buffer ); } else { puts( "buffer too small" ); } } }
Code:#include <cmath> #include <complex> bool euler_flip(bool value) { return std::pow ( std::complex<float>(std::exp(1.0)), std::complex<float>(0, 1) * std::complex<float>(std::atan(1.0) *(1 << (value + 2))) ).real() < 0; }
Thank you all for your input, it has given me a lot to think about and to learn. I will try to understand fully what you have all shown.
I will not look into how to consolidate all this and to learn how to actually manipulate the files now.
Thanks again!
