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#include<stdio.h> #include<conio.h> int main() { int themang, n, i; do { printf("\nNhap n: "); scanf("%d", &n); }while(n < 0 && printf("\nLoi: (n >= 0)")); themang = n; /*do { i = themang % 10; themang /= 10; }while(themang != 0);*/ //có thể viết do { i = themang % 10; }while(themang /= 10); printf("\nChu so dau tien la %d", i); getch(); return 0; }
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