Which of the following is not a correct variable type?

Which of the following is not a correct variable type?

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

3) 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");
 }

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

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

5) The format identifier ‘%i’ is also used for _____ data type?