作业帮S←1 For i from 1to4 S←S+2^iEND FOR Print S
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S←1 For i from 1to4 S←S+2^iEND FOR Print S
S←1 For i from 1to4 S←S+2^i
END FOR Print S
S←1 For i from 1to4 S←S+2^iEND FOR Print S
s=1;
i=1, s=1+2^1=3;
i=2, s=3+2^2=7;
i=3, s=7+2^3=15;
i=4, s=15+2^4=31;
所以打印 31
相当于等比数列求和，从2的0次方加到2的4次方
S=1+2^1+2^2+2^3+2^4=(1*(1-2^5))/(1-2)=2^5-1=31