Is there any difference between following declarations?

  1.  

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Is there any difference between following declarations?

  1.  extern int fun();
  2.  int fun();

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1) Predict the output

 #include <stdio.h>
int main()
{
float c = 5.0;
printf ("Temperature in Fahrenheit is %.2f", (9/5)*c + 32);
return 0;
}

2) Size of an int data type is ________ ?

3) What will be the output of the following C code on a 32-bit machine?

 #include <stdio.h>
int main()
{
int x = 10000;
double y = 56;
int *p = &x;
double *q = &y;
printf("p and q are %d and %d", sizeof(p), sizeof(q));
return 0;
}

4) For 16-bit compiler allowable range for integer constants is ________?

5) Integral data type is _________?

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