编程序求10000之内的完全平方数的平方根
#include main()
{
int a,b,d,e,f;
int A;
int i,j;
printf("\n\n***** 先把100以内的自然数打出来*****\n\n"); /*在Tc2.0下要注意把汉字改为英文 */
for(i=0;i<100;i++)
{ j=i*i;
printf(" %d*%d=%d ",i,i,j);
if(i%5==0)
printf("\n");
}
printf("\nPlsease enter a number:");
scanf("%d",&A);
while(A!=0) /* A是1到9999之间的任意一个完全平方数 */
{
if(A>=100)/* 对A分情况讨论 */
{ a=A/100; /* A除以100取整赋给a */
if(a>=1&&a<=3)
b=1;
if(a>=4&&a<=8)
b=2;
if(a>=9&&a<=15)
b=3;
if(a>=16&&a<=24)
b=4;
if(a>=25&&a<=35)
b=5;
if(a>=36&&a<=48)
b=6;
if(a>=49&&a<=63)
b=7;
if(a>=64&&a<=80)
b=8;
if(a>=81&&a<=99)
b=9;
}
if(A<100)
{ if(A==1)
{ b=1;
printf("\nthe root of A is %d",b);
printf("\nPlsease enter a number:");
scanf("%d",&A);
}
if(A==4)
{ b=2;
printf("\nthe root of A is %d",b);
printf("\nPlsease enter a number:");
scanf("%d",&A);
}
if(A==9)
{ b=3;
printf("\nthe root of A is %d",b);
printf("\nPlsease enter a number:");
scanf("%d",&A);
}
if(A==16)
{ b=4;
printf("\nthe root of A is %d",b);
printf("\nPlsease enter a number:");
scanf("%d",&A);
}
if(A==25)
{ b=5;
printf("\nthe root of A is %d",b);
printf("\nPlsease enter a number:");
scanf("%d",&A);
}
if(A==36)
{ b=6;
printf("\nthe root of A is %d",b);
printf("\nPlsease enter a number:");
scanf("%d",&A);
}
if(A==49)
{ b=7;
printf("\nthe root of A is %d",b);
printf("\nPlsease enter a number:");
scanf("%d",&A);
}
if(A==64)
{ b=8;
printf("\nthe root of A is %d",b);
printf("\nPlsease enter a number:");
scanf("%d",&A);
}
if(A==81)
{ b=9;
printf("\nthe root of A is %d",b);
printf("\nPlsease enter a number:");
scanf("%d",&A);
}
}
d=A-b*b*100; /* 变量b是第一次试商 */
e=d/(b*20); /* e 是第二次试商 */
if(e>=10)
e=e-1;
while(((b*20+e)*e)!=d)
e=e-1;
f=b*10+e;/* 变量f是所求平方根 */
printf("\nthe root of A is %d",f);
printf("\nPlsease enter a number:");
scanf("%d",&A);
}
}
此程序在VC++6.0 下编译运行通过，在Tc2.0也可以运行但要注意把汉字注释删除
运行结果如下
***** 先把100以内的自然数打出来*****
0*0=0
1*1=1 2*2=4 3*3=9 4*4=16 5*5=25
6*6=36 7*7=49 8*8=64 9*9=81 10*10=100
11*11=121 12*12=144 13*13=169 14*14=196 15*15=225
16*16=256 17*17=289 18*18=324 19*19=361 20*20=400
21*21=441 22*22=484 23*23=529 24*24=576 25*25=625
26*26=676 27*27=729 28*28=784 29*29=841 30*30=900
31*31=961 32*32=1024 33*33=1089 34*34=1156 35*35=1225
36*36=1296 37*37=1369 38*38=1444 39*39=1521 40*40=1600
41*41=1681 42*42=1764 43*43=1849 44*44=1936 45*45=2025
46*46=2116 47*47=2209 48*48=2304 49*49=2401 50*50=2500
51*51=2601 52*52=2704 53*53=2809 54*54=2916 55*55=3025
56*56=3136 57*57=3249 58*58=3364 59*59=3481 60*60=3600
61*61=3721 62*62=3844 63*63=3969 64*64=4096 65*65=4225
66*66=4356 67*67=4489 68*68=4624 69*69=4761 70*70=4900
71*71=5041 72*72=5184 73*73=5329 74*74=5476 75*75=5625
76*76=5776 77*77=5929 78*78=6084 79*79=6241 80*80=6400
81*81=6561 82*82=6724 83*83=6889 84*84=7056 85*85=7225
86*86=7396 87*87=7569 88*88=7744 89*89=7921 90*90=8100
91*91=8281 92*92=8464 93*93=8649 94*94=8836 95*95=9025
96*96=9216 97*97=9409 98*98=9604 99*99=9801
Plsease enter a number:4096
the root of A is 64
Plsease enter a number:7569
the root of A is 87
Plsease enter a number:4761
the root of A is 69
Plsease enter a number:5476
the root of A is 74
Plsease enter a number:
