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Question

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Explanation / Answer

Question 1:

int i, n;
int myArray[n][n]; // array of size n * n.
// loop through diagonal
for(i = 0; i < n; i++)
printf("%d", myArray[i][i]); // printing diagonal elements

Question 2:

int row, column = 2, width = 2;
int myArray[10][10];
// looping through 2nd, 5th and 9th column
for(row = 0; row <= 9; row++){
if(column <= 9)
printf("%d", myArray[row][column]; // printing 2nd, 5th and 9th column elements
if(row == 9 && column <= 9){ // To jump to next desired column
width++;
column = column + width;
row = 0;
}
}

Question 4:

int givenNo, a = 0, b = 1, c = 0;
while(c < givenNo){
c = a + b;
a = b;
b = c;
}
if(c == givenNo)
printf("Fibonacci number.");
else
printf("Not a fibonacci number.");

Question 5:

int givenNo, a = 0, b = 1, c = 0;
while(c < givenNo){
c = a + b;
a = b;
b = c;
}
if(c == givenNo)
printf("Fibonacci number.");
else
printf("Not a fibonacci number.");

Question 6:

int myArray[10][10];
int i, j; // stores ith row and jth column
printf(" Enter ith row: ");
scanf("%d", &i);
printf(" Enter jth column: ");
scanf("%d", &j);
printf("ith row and jth column element: ", myArray[i][j]);

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