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As you know from "Hello World" program, you would know that printf() is a function to print out anything that you specified. It is very simple to use, but we often get confused by what kind of format we have to specify in order to get the right format that we want to get. The syntax is as simple as follows. int printf(const char *format, ...); I would look very simple.. but you will see a long list of descriptions about '*format', but just reading throught the document would not help you much. I think the bunch of examples without much explanation would be bettern than long dry writing.
Printing Numbers in various format
#include <stdio.h>
void main() { int d = 123; float f = 123.45;
printf("%d\n",d) ; printf("%8d\n",d) ; printf("%08d\n",d) ; printf("%x\n",d) ; printf("0x%x\n",d) ; printf("%#x\n",d) ; printf("0x%8x\n",d); printf("%#10x\n",d) ; printf("0x%08x\n",d) ; printf("%#010x\n",d) ; printf("%#X\n",d) ; printf("0x%8X\n",d) ; printf("%#10X\n",d) ; printf("0X%08X\n",d) ; printf("%#010X\n",d) ; printf("%f\n",f) ; printf("%8.2f\n",f) ; printf("%08.2f\n",f) ; printf("%8.3f\n",f) ; printf("%08.3f\n",f) ;
}
Result :------------------------------------
printf("%d",d) ==>123 printf("%8d",d) ==> 123 printf("%08d",d) ==>00000123 printf("%x",d) ==>7b printf("0x%x",d) ==>0x7b printf("%#x",d) ==>0x7b printf("0x%8x",d) ==>0x 7b printf("%#10x",d) ==> 0x7b printf("0x%08x",d) ==>0x0000007b printf("%#010x",d) ==>0x0000007b printf("%#X",d) ==>0X7B printf("0x%8X",d) ==>0x 7B printf("%#10X",d) ==> 0X7B printf("0X%08X",d) ==>0X0000007B printf("%#010X",d) ==>0X0000007B printf("%f",f) ==>123.449997 printf("%8.2f",f) ==> 123.45 printf("%08.2f",f) ==>00123.45 printf("%8.3f",f) ==> 123.450 printf("%08.3f",f) ==>0123.450
#include <stdio.h> #include <stdlib.h>
int main() { long xLong = 2147483647; long long xLongLong = 9223372036854775807;
printf("%d\n",xLong); printf("%ld\n",xLong); printf("\n"); printf("%d\n",xLongLong); printf("%ld\n",xLongLong); printf("%lld",xLongLong);
return(0); }
Result :------------------------------------ xLong in (%d) = 2147483647 xLong in (%ld) = 2147483647
xLongLong in (%d) = -1 xLongLong in (%ld) = -1 xLongLong in (%lld) = 9223372036854775807
printing a number in scientific format
#include <stdio.h> #include <stdlib.h> #include <math.h>
int main() { double xDouble = 2147483647.0;
printf("%f\n",xDouble); printf("%e\n",xDouble); printf("%E\n",xDouble); printf("%g\n",xDouble); printf("%G\n",xDouble);
return(0); }
Result :------------------------------------ xDouble in (%f) = 2147483647.000000 xDouble in (%e) = 2.147484e+009 xDouble in (%E) = 2.147484E+009 xDouble in (%g) = 2.14748e+009 xDouble in (%G) = 2.14748E+009
Printing a number in binary format
There is no printf option or any other functions to print a number in a binary format. So you need to create such a function on your own. Refer to Printing in a Binary Format example.
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