a$)$ Identify the errors from the following program #include Int main$()\{$ Int a$,$ b; Int div; Scanf$(\%$f$\%$f$,$ &a$,$ b$)$; Div$=$a$/$b; Printf$(\%$d$,$ Div$)$; Return $0$; $\}[2]$ b$)$ Check whether the following variables are valid or invalid. If it is invalid, mention the reason. Sum val, Sum$\_$val, $Sumval, Sum$9$val, $9$Sumval, sum val $[2]$ c$)$ Find the values of the following variables int a$=39/2$; int b$=39\mathrm{.}0/2$; float c$=39\mathrm{.}0/2$; float d$=39/2$; int e$=39\%4$; float f$=($float$)(4\%39)$; $[2]2$ a$)$ Find output when input values of b are $4,5,10$ and $12,$ respectively scanf$(\%$d$,$ &b$)$; printf$($Start

$)$; if $($b$<=5)$ printf$($Hello

$)$; else if$($b$>5)$ printf$($World

$)$; else if $(($b$>=2)$&&$($b$<10))$ printf$($UIU

$)$; else if $(($b$>2)||($b$<=10))$ printf$($CSE

$)$; else printf$($Error

$)$; printf$($Stop$)$; $[3]$ b$)$ Write the following program using the Switch Case statement in Programming Language C #include int main$()\{$ int choice; if$(($choice$=1)||($choice$==2))$ printf$($CSE

$)$; else if $($ choice$==3)$ printf$($UIU

$)$; else if $($choice$>3)$ printf$($Bye$)$; return $0$; $\}[3]3$ a$)$ Draw a flowchart to find the sum of the following series. Also show the sum value on monitor. $2+4+6+.......+100[3]$ b$)$ Write a program to calculate the online average of $4$ positive floating point numbers taken from keyboard as inputs. Follow the sample input and output given below for understanding the logic. $[3]$ United International University $($UIU$)$ Dept. of Computer Science & Engineering $($CSE$)$ Page $2$ of $2$ Sample Input Processing Output on Monitor num$=10\mathrm{.}010\mathrm{.}0/1=10\mathrm{.}0$ Average$=10\mathrm{.}0$ num$=-5\mathrm{.}0--$ num$=20\mathrm{.}0(10\mathrm{.}0+20\mathrm{.}0)/2=15\mathrm{.}0$ Average$=15\mathrm{.}0$ num$=-18\mathrm{.}6--$ num$=15\mathrm{.}6(10\mathrm{.}0+20\mathrm{.}0+15\mathrm{.}6)/3=15\mathrm{.}2$ Average$=15\mathrm{.}2$ num$=15\mathrm{.}2(10\mathrm{.}0+20\mathrm{.}0+15\mathrm{.}6+15\mathrm{.}2)/4=15\mathrm{.}2$ Average$=15\mathrm{.}24$ a$)$ Show manual tracing for the following code segment for$($i$=3$; i$>=1$; i$--)\{$ for $($j$=1$; j$<=$i; j$++)\{$ printf$(\%$d$,2*$j$+1)$; $\}$ printf$($

$)$; $\}[3]$ b$)$ Write a program to perform the following operations i$)$ Declare an integer array of size $500$ ii$)$ Read n integer numbers from keyboard and store them in the array, where n is input integer from keyboard iii$)$ Find the sum of the numbers that are stored in odd number indices in the array iv$)$ Also show all the integer numbers of the array on monitor $[3]5$ a$)$ Show manual tracing for the following code segment char str$1[7]=\{\backslash 0\}$; char str$2[7]=\{0\}$; strcpy$($str$1,$CSE$)$; strcpy$($str$2,$UIU$)$; strcat$($str$2,$ str$1)$; strrev$($str$2)$; puts$($str$2)$; printf$($

$)$; puts$($str$1)$; int i$=$strlen$($str$2)$; printf$($

The length of $\%$s is$=\%$d$,$ str$2,$ i$)$; $[3]$ b$)$ Write a program to determine the maximum among the numbers that are stored in i$-$th row of the two dimensional array A$[$n$][$n$],$ where i