Wrong output sprintf C51 8051 MCU embedded system

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Wrong output sprintf C51 8051 MCU embedded system



I have the following fragment of C code for an AT89S52 microcontroller:


unsigned char x = 0x10;
unsigned char str[21];

sprintf(srt, "%u", (x >> 4) );



Can someone tell me why does my string contain "256" instead of "1" ?, the x variable isn't even big enough to hold the 256 value.



I'm compiling with KEIL uVision 5, using the standard stdio.h library.



If I use:


void UlToStr(char *s, unsigned long bin, unsigned char n)

s += n;
*s = '';

while (n--)

*--s = (bin % 10) + '0';
bin /= 10;




instead of sprintf the string holds a 1 as a value.





I find it hard to believe that this code is behaving as described.
– Eugene Sh.
1 hour ago





Are you sure that shift is what you show us? Or the initial value of x?
– Some programmer dude
1 hour ago


x





How do you know what the string is containing?
– Eugene Sh.
1 hour ago





Also, when passing values of smaller types (like char or short) to a vararg function (like printf) those values will be promoted to int or possible unsigned int.
– Some programmer dude
1 hour ago


char


short


printf


int


unsigned int





@Someprogrammerdude The result of >> is already int.
– Eugene Sh.
1 hour ago


>>


int









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