c:stdio.h:fprintf
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c:stdio.h:fprintf [2013/01/22 22:02] |
c:stdio.h:fprintf [2024/02/16 01:05] (current) |
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| + | {{keywords>wiki library source code example reference}} | ||
| + | ====== fprintf ====== | ||
| + | <code c> | ||
| + | int fprintf(FILE *stream, const char *format, ...); | ||
| + | </code> | ||
| + | |||
| + | Converts (according to format format) and writes output to stream stream. Number of characters written, or negative value on error, is returned.\\ | ||
| + | \\ | ||
| + | optional flag:\\ | ||
| + | \\ | ||
| + | - left adjust\\ | ||
| + | + always sign\\ | ||
| + | 0 zero pad\\ | ||
| + | # Alternate form: for conversion character o, first digit will be zero, for [xX], prefix 0x or 0X to non-zero value, for [eEfgG], always decimal point, for [gG] trailing zeros not removed. \\ | ||
| + | \\ | ||
| + | optional minimum width: if specified as *, value taken from next argument (which must be int).\\ | ||
| + | optional . (separating width from precision)\\ | ||
| + | optional precision: for conversion character s, maximum characters to be printed from the string, for [eEf], digits after decimal point, for [gG], significant digits, for an integer, minimum number of digits to be printed. If specified as *, value taken from next argument (which must be int).\\ | ||
| + | \\ | ||
| + | optional length modifier:\\ | ||
| + | |||
| + | h short or unsigned short\\ | ||
| + | l long or unsigned long\\ | ||
| + | L long double\\ | ||
| + | |||
| + | conversion character:\\ | ||
| + | |||
| + | d,i int argument, printed in signed decimal notation\\ | ||
| + | o int argument, printed in unsigned octal notation\\ | ||
| + | x,X int argument, printed in unsigned hexadecimal notation\\ | ||
| + | u int argument, printed in unsigned decimal notation\\ | ||
| + | c int argument, printed as single character\\ | ||
| + | s char* argument\\ | ||
| + | f double argument, printed with format [-]mmm.ddd\\ | ||
| + | e,E double argument, printed with format [-]m.dddddd(e|E)(+|-)xx\\ | ||
| + | g,G double argument\\ | ||
| + | p void* argument, printed as pointer\\ | ||
| + | n int* argument : the number of characters written to this point is written into argument\\ | ||
| + | % no argument; prints %\\ | ||
| + | |||
| + | |||
| + | |||
| + | ===== C Sourcecode Example ===== | ||
| + | <code c> | ||
| + | /* | ||
| + | * fprintf example code | ||
| + | * http://code-reference.com/c/stdio.h/fprintf | ||
| + | */ | ||
| + | |||
| + | |||
| + | #include <stdio.h> /* including standard library */ | ||
| + | //#include <windows.h> /* uncomment this for Windows */ | ||
| + | |||
| + | #define MAX 60 | ||
| + | |||
| + | int main ( void ) | ||
| + | { | ||
| + | FILE * stream; | ||
| + | char string[MAX]; | ||
| + | char c; | ||
| + | |||
| + | sprintf(string,"This string will be cut here - This will not be shown"); | ||
| + | |||
| + | stream = fopen ("test.txt","w"); | ||
| + | fprintf (stream, "%-8.28s ",string); // -8 is minimun and after the . (in this case 28) is maximum chars | ||
| + | |||
| + | freopen("test.txt", "r", stream); | ||
| + | while((c = fgetc(stream) ) != EOF) { | ||
| + | printf("%c", c ); | ||
| + | } | ||
| + | |||
| + | printf("\n"); | ||
| + | fclose (stream); | ||
| + | return 0; | ||
| + | } | ||
| + | |||
| + | </code> | ||
| + | |||
| + | ==== fprintf output example ==== | ||
| + | output:./fprintf | ||
| + | This string will be cut here | ||
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