This program example of forward declartion is in Pascal, I want to write it in Prolog language

Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
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This program example of forward declartion is in Pascal, I want to write it in Prolog language

2 Program calculateavg;
3\
var
4 a,b,c, sum: integer;
5 avg :Double;
7 function findsum(x,y,z: integer; var sum: integer): integer; forward;
8.
9 function findavg(x,y,z: integer; var average: Double): Double;
10- begin
average: findsum(x,y,z, sum);
average:average/3;
11
12
13 end;
14
15 function findsum(x,y,z: integer; var sum: integer): integer;
16 begin
17
SUm:
18 end;
Xy+z;
19
20- begin
writeln('program to calculate the average of 3 numbers');
write ('Enter the value of a: ');
readln (a);
write ('Enter the value of b: );
readin (b);
write ('Enter the value of c: ');
readln (c);
findavg(a,b,c, avg);
writeln('average is =', avg);
21
22
23
24
25
26
27
28
29
30 end.
Transcribed Image Text:2 Program calculateavg; 3\ var 4 a,b,c, sum: integer; 5 avg :Double; 7 function findsum(x,y,z: integer; var sum: integer): integer; forward; 8. 9 function findavg(x,y,z: integer; var average: Double): Double; 10- begin average: findsum(x,y,z, sum); average:average/3; 11 12 13 end; 14 15 function findsum(x,y,z: integer; var sum: integer): integer; 16 begin 17 SUm: 18 end; Xy+z; 19 20- begin writeln('program to calculate the average of 3 numbers'); write ('Enter the value of a: '); readln (a); write ('Enter the value of b: ); readin (b); write ('Enter the value of c: '); readln (c); findavg(a,b,c, avg); writeln('average is =', avg); 21 22 23 24 25 26 27 28 29 30 end.
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