Is there any difference between following declarations?

1.  

Is there any difference between following declarations?

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

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

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

 #include <stdio.h>
 int main()
 {
    float x = 'a';
    printf("%f", x);
    return 0;
 }

3) Which of the following is not a correct variable type?

4) Size of an int data type is ________ ?

5) The Format Identifier %u is used for?