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C, pasted on Nov 29:
 ```1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 ``` ```#include #include #include #define MAX 100 void NhapMaTran(int a[][MAX], int &dong, int &cot) { for(int i = 0; i < dong; i++) { for(int j = 0; j < cot; j++) { printf("\nNhap a[%d][%d] = ", i, j); scanf("%d", &a[i][j]); } } } void XuatMaTran(int a[][MAX], int dong, int cot) { for(int i = 0; i < dong; i++) { for(int j = 0; j < cot; j++) { printf("%4d", a[i][j]); } printf("\n\n"); } } void TinhTong2MaTran(int a[][MAX], int b[][MAX], int c[][MAX], int dong, int cot) { for(int i = 0; i < dong; i++) { for(int j = 0; j < cot; j++) { c[i][j] = a[i][j] + b[i][j]; } } } int main() { int a[MAX][MAX], b[MAX][MAX], c[MAX][MAX], dong, cot; //Nhập số dòng do { printf("\nNhap vao so dong: "); // Cách tà đạo: scanf("dong =%d",&dong); // Lúc nhập phải viết thêm chữ ( dong = ) ở khung console scanf("%d",&dong); if(dong < 1 || dong > MAX) { printf("\nSo dong khong hop le. Xin kiem tra lai!"); } }while(dong < 1 || dong > MAX); //Nhập số cột do { printf("\nNhap vao so cot: "); scanf("%d",&cot); if(cot < 1 || cot > MAX) { printf("\nSo cot khong hop le. Xin kiem tra lai!"); } }while(cot < 1 || cot > MAX); printf("\nNhap vao ma tran A: \n"); NhapMaTran(a, dong, cot); printf("\nNhap vao ma tran B: \n"); NhapMaTran(b, dong, cot); printf("\nMa tran A vua nhap: \n"); XuatMaTran(a, dong, cot); printf("\nMa tran B vua nhap: \n"); XuatMaTran(b, dong, cot); TinhTong2MaTran(a, b, c, dong, cot); printf("\nMa tran C = A + B \n"); XuatMaTran(c, dong, cot); getch(); return 0; } ```

Output:
 ```1 2 3 4 5 6 7 8 ``` ```Line 17: error: conio.h: No such file or directory Line 6: error: expected ';', ',' or ')' before '&' token In function 'XuatMaTran': Line 20: error: 'for' loop initial declaration used outside C99 mode Line 22: error: 'for' loop initial declaration used outside C99 mode In function 'TinhTong2MaTran': Line 32: error: 'for' loop initial declaration used outside C99 mode Line 34: error: 'for' loop initial declaration used outside C99 mode ```

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