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

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

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1) 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;
 }

2) The C language defines ________ fundamental data types

3) What will be the output of the following C code?

 #include <stdio.h>
 int main()
 {
    float f1 = 0.1;
    if (f1 == 0.1f)
       printf("equal\n");
    else
       printf("not equal\n");
 }

4) Which of the data types has the size that is variable?

5) What is the output of this C code?

#include  
     int main()
     {
        signed char chr;
        chr = 128;
        printf(