promotion « integer « C Data Type Q&A

1. In a C expression where unsigned int and signed int are present, which type will be promoted to what type?    stackoverflow.com

I have a query about data type promotion rules in C language standard. The C99 says that: C integer promotions also require that "if an int can represent all values of the original ...

2. How does the last integer promotion rule ever get applied in C?    stackoverflow.com

6.3.1.8p1: Otherwise, the integer promotions are performed on both operands. Then the following rules are applied to the promoted operands: If both operands have the same type, ...

3. Yoda Conditions and integer promotion    stackoverflow.com

When comparing a type larger than int, with an integer constant, should I place the constant on the left or the right to ensure the correct comparison is performed?

int64_t i = ...

4. Puzzle by C type promotion from short to int    stackoverflow.com

I have a question that needs guidance from any expert:

1. As a value with short type is passed as an argument to printf() function, it'll be automatically promoted to int type, that ...

5. Why are the results of integer promotion different?    stackoverflow.com

Please look at my test code:

#include <stdlib.h>
#include <stdio.h>


#define PRINT_COMPARE_RESULT(a, b) \
    if (a > b) { \
        printf( #a " > ...

6. type promotion in C    stackoverflow.com

I am quite confused by the following code:

#include <stdio.h>
#include <stdint.h>

int main(int argc, char ** argv)
{
    uint16_t a = 413;
    uint16_t b = 64948;

   ...

7. Integer promotion    bytes.com

Consider the following program: #include #include #include int main(int argc, char **argv) { uint32_t a = strtoul(argv[1], 0, 0); uint32_t b = strtoul(argv[2], 0, 0); double d = a-b; printf("%f\n", d); return 0; } $ ./a.out 5 6 4294967295.000000 This is what I expected. Since a-b would be negative, the result is a-b+2^32. However, if I replace uint32_t ...

8. Integer promotion?    bytes.com

On my system, the following doesn't work properly: #define UCHAR_MAX ( ~( (unsigned char)0 ) ) Could someone please explain why it doesn't work? My hunch is that it has something to do with integer promotion. Since the previous example doesn't work, why is it that the following does? template AnyUnsignedIntegerType MaxVal() { return ~AnyUnsignedIntegerType(0); } #include int main() ...