CareerCup

// Off the top of my head. If this crashes, it's SPARC.  Otherwise it's Intel.
int main(void) {
  int x;
  *(((char*)&x)+1)=1;
}

uname -a | grep sparc | wc -l

if output =1 it is a sparc machine or else it is a intel machine.

x86 - little endian
sparc - big endian

int i;
     int testInt=0xff;
     unsigned char *testChar;
     
     testChar = &testInt;
     for (i=1; i<=4; i++)
     {
        printf("value in byte %d is %d\n", i, *testChar);
        testChar++;
     }

Assuming we are running linux

cat /proc/cpuinfo | grep -i Intel

1 #include<stdio.h>
  2 
  3 int main()
  4 
  5 {
  6 
  7     int x =1;
  8 
  9     char *c = (char*)&x;
 10 
 11     if(*c)
 12 
 13         printf("Little endian");
 14 
 15     else
 16 
 17         printf("Big endian");
 18 
 19 }