unsigned char a = (unsigned char)-5;
unsigned char b = (unsigned char)94;

int c = (int)((((unsigned int) a) << 8) | (unsigned int) b);

printf("%dn", c);

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

int main() {
    unsigned char a = (unsigned char)-5;
    unsigned char b = (unsigned char)94;
    int16_t c = (int16_t)((((unsigned int) a) << 8) | (unsigned int) b);
    printf("%dn", c);
}

unsigned char a = (unsigned char)-5;
unsigned char b = (unsigned char)94;
int c = (signed char)a << 8 | b;
printf("%dn", c); // Prints -1186

signed char x = -5;
signed char y = 94;
int c = x * 256 + y;

int c = (int16_t)(x * 256 + y);