西工大C语言POJ习题答案 - 图文(7)

23.

#include #include int main()

{

double x1,x2,x3=0,a; scanf(\ x1=a;

while(fabs(x1-x3)>=0.00001) {

x2=(x1+a/x1)/2; x3=x1; x1=x2;

}

printf(\ return 0; } 24.

#include int main() { int i; }

double a=1,sum=0;

for(i=1;1/a>=0.000001;i++) {

if(i%2==0)sum=sum-1/a; else sum=sum+1/a; a=a+2; }

sum=sum*4; printf(\return 0;

25.

#include int main()

{ int a,i,n; for (a=6;a<=1000;a++) { n=0; } 三.

} return 0;

for(i=1;i

if(a%i==0) n=n+i; }

if(n==a)

{ printf(\ }

for (i=1;i

if(a%i==0) { if(i

else printf(\

printf(\

第三季已齐全

21.

#include #include int main() {

int x,y,a,b,l,s1,s2,t;

scanf(\if(x

s1=(y-x);s2=l-s1;

if(a>b){t=s1/(a-b); printf(\ else if(a

else{ s1=x-y;s2=l-s1;

if(a>b){t=s2/(a-b); printf(\ else if(a

} return 0;

#include #include int main()

{

int N,i,j,k,x,a,cnt=0; scanf(\ for(k=7;k<=N;k++) {

j=k;

for(i=4;i>=0;i--) {

a=(int)pow(10,i); x=j/a;

if(x==7||k%7==0) {

printf(\ break; }

else j=j-a*x; } }

return 0; } 23.