What is the size of an int data type?

What is the size of an int data type?

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1) Which of the following is a User-defined data type?

2) Predict the output

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

3) Predict the output of following C program

 #include <stdio.h>
 int main()
 {
     char a = '12';
     printf("%d", a);
     return 0;
 }

4) Which of the following is not a valid declaration in C?

5) 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;
 }