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- BÀI 18:
- #include <conio.h>
- #include <stdio.h>
- float tong(float a)
- {
- float i;
- float tong=1, dau=(-1);
- for (i=1; i<=a; i++)
- {
- tong=tong+dau*1/(2*i+1);
- dau=dau*(-1);
- }
- return tong;
- }
- main()
- {
- float c;
- float n=0, pi;
- printf(" Nhap vao so c la: ");
- scanf("%f", &c);
- while (1>((2*n+1)*c))
- {
- n++;
- }
- pi=4*tong(n);
- printf(" Gia tri so pi la: %f\n", pi);
- getch();
- }
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