Script for comparing I/O in stdlib and iostreams.

test.sh

#!/bin/sh

times=1000000 # count
main="int main(){"
loop=" for(int i = 0; i < $times; i++) "
end=" return 0;}"
CXX=g++
FLAGS=-O2

file=test.cpp # outfile
ofile=test.out # executable outfile

ifile=test.in # infile

if [ ! -e $ifile ]
then
  seq 0 $powt > $ifile
fi

echo "Output:"

echo -e "#include<iostream> \n$main $loop std::cout << i;$end" > $file
echo "std::cout bez sync_with_stdio(0)"
$CXX -o $ofile $file $FLAGS
time ./$ofile > /dev/null

echo -e "#include<iostream> \n$main std::ios_base::sync_with_stdio(0); $loop std::cout << i;$end" > $file
echo -e "\nstd::cout z sync_with_stdio(0)"
$CXX -o $ofile $file $FLAGS
time ./$ofile > /dev/null

echo -e "#include<cstdio> \n$main $loop printf(\"%d\", i);$end" > $file
echo -e "\nprintf()"
$CXX -o $ofile $file $FLAGS
time ./$ofile > /dev/null

echo -en "\nOutput:"

echo -e "#include<iostream> \n$main int test; $loop { std::cin >> test;}$end" > $file
echo -e "\nstd::cin bez sync_with_stdio(0)"
$CXX -o $ofile $file $FLAGS
time ./$ofile < $ifile

echo -e "#include<iostream> \n$main std::ios_base::sync_with_stdio(0); int test; $loop { std::cin >> test;}$end" > $file
echo -e "\nstd::cin z sync_with_stdio(0)"
$CXX -o $ofile $file $FLAGS
time ./$ofile < $ifile

echo -e "#include<cstdio> \n$main int test; $loop { scanf(\"%d\", &i);}$end" > $file
echo -e "\nscanf()"
g++ -o $ofile $file $FLAGS
time ./$ofile < $ifile

rm $ofile $ifile #file