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The logic depicted in Figure 11.4, therefore, will read the student's record, calculate the
percentage marks obtained by him/her, print one line of output, and then stop. One would
certainly not like to use a computer to solve a trivial problem such as this. However, if we
have to compute the percentage marks obtained by several students in the same
examination then we may like to take the help of a computer. The next example
illustrates how to do this.
50 students of a class appear in the examination of Example 11.3. Draw a flowchart for
the algorithm to calculate and print the percentage marks obtained by each student along
with his/her roll number and name.
Since all the students have appeared in the same examination, so the process of
calculation and printing the percentage marks obtained by each student will basically
remain the same. The same process of reading the input data, adding the marks of all
subjects, calculating the percentage, and then writing the output data has to be repeated
for all the 50 students. Hence, an easy solution that comes to ones mind for this problem
is to repeat the intermediate four symbols of Figure 11.4 fifty times. However if that is
done, a total of 202 (50 x 4 + 2) flowchart symbols will have to be drawn. Obviously, this
will be a very time consuming and tedious job and hence is not desirable. We will now
see how to solve this problem in a simpler way.
In a situation where the same logical steps can be repeated, the flow line symbols are
used in a flowchart to indicate the repetitive nature of the logic in the form of a process
loop. Figure 11.5 illustrates a flowchart with a process loop. Note the arrow head on the
flow line that forms the loop. It points upward indicating that as soon as the "Write"
operation is over, the control will flow back to the "Read" operation. Thus, the process
loop of Figure 11.5 solves the problem of an exceedingly long flowchart by reusing the
same logical steps over and over again. However,...
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This document was uploaded on 04/07/2014.
- Spring '14