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#include #include int main() {

float a,b,c,x1,x2,m;

printf(\ scanf(\ m=b*b-4*a*c; if (m<0){

printf(\ } else{

x1=(-b+sqrt(m))/(2*a); x2=(-b-sqrt(m))/(2*a);

printf(\ }

return 0; }

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5.1

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1, you have enter 1-bits number 6¨L

6, you have enter 2-bits number a¨L error d¨L error 4¨L

4, you have enter 3-bits number

6¨L

6, you have enter 4-bits number 8¨L

8, you have enter 5-bits number 2¨L

2, you have enter 6-bits number

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#include int main() {

char a; int i=0;

printf(\ while(i<6) {

scanf(\ if (a>=48&&a<=57) {

printf(\ } else

printf(\ getchar(); }

return 0; }

5.2

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³ÌÐòÔËÐнá¹ûʾÀý1£º Please enter the number: 21125¨L 21125: 5 bits

³ÌÐòÔËÐнá¹ûʾÀý2£º Please enter the number: -12234¨L -12234: 5 bits

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#include int main(){ int x,y,n;

printf(\ scanf(\ n=x;

for(y=1;x/=10;y++);

printf(\ return 0; }

5.3

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³ÌÐòÔËÐнá¹ûʾÀý1£º Please enter the number: 1¨L 1:odd

5¨L 5:odd 8¨L 8:even 9¨L 9:odd 12¨L 12:even 17¨L 17:odd -1¨L

The total number of odd is 4 The total number of even is 2

³ÌÐòÔËÐнá¹ûʾÀý2£º Please enter the number: -1¨L over!

The total number of odd is 0 The total number of even is 0

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#include int main(){

int s,odd=0,even=0;

printf(\ do{

scanf(\

if (s==-1&&odd==0&&even==0) printf(\ else if( s%2!=0 &&s!=-1) {printf(\ else if (s%2==0){printf(\