Returns the sum of the surrounding elements of the two-dimensional array as the function value

The sum of the surrounding elements of the two-dimensional array is returned as the function value

The first for loop is used to calculate the sum of the top row and the bottom row of the matrix, and the second for loop is used to calculate the sum of the elements in the leftmost column and the rightmost column except the two elements. Finally, the two summations are added together to obtain the sum of the surrounding elements.

〔Source program〕

#include

#include

#define M 4

#define N 5

int fun(int a[M][N])

{int sum=0,i;

for(i=0;i

sum =a[0][i] a[M-1][i];

for(i=1;i

sum =a[i][0] a[i][N-1];

return sum ;

}

main()

{ int aa[M][N]={{1,3,5,7,9},

{2,9,9,9,4},

{6,9,9,9,8},

{1,3,5,7,0}};

int i,j,y;

clrscr();

printf("The original data is :\\n");

for(i=0;i

{for(j=0;j

printf(＂\\n＂);

}

y=fun(aa);

printf(＂\\nThe sum: %d\\n＂,y);

printf(＂\\n＂);

}

Sum of edge elements of two-dimensional array

private function Anyl(A()() AS INTEGER,byval m as integer,byval n as integer) as long

tol=sum_side(A,m,n)

print tol

if m=n then

sd=Diag(A,m)

sid=InDiag(A,m)

print sd

print sid

else

print "m≠n"

end if

end function

private function Sum_side(A()() AS INTEGER,byval m_side as integer,byval n_side as integer) as long

dim sum as long

sum=0

n_side=n_side-1

for i=0 to n step 1

sum=sum A(0)(i)

next i

m=m-2

for i=1 to m step 1

sum=sum A(i)(0)

sum=sum A(i)(n)

next i

m=m 1

for i=0 to n step 1

sum=sum A(m)(i)

next i

sum_side=sum

end function

private function Diag(A()() AS INTEGER,byval m as integer) as long

dim Sum_Diag as long

m=m-1

Sum_Diag=0

FOR i=0 to m step 1

Sum_Diag=Sum_Diag A(i)(i)

next i

Diag=Sum_Diag

end function

private function InDiag(A()() AS INTEGER,byval m as integer) as long

dim Sum_InDiag as long

m=m-1

Sum_Diag=0

FOR i=0 to m step 1

Sum_InDiag=Sum_InDiag A(i)(m-i)

next i

InDiag=Sum_InDiag

end function

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