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View Compilation Error

0_0_35653402_19738\Main.java:7: 错误: 找不到符号
		while(n-->0){
		      ^
  符号:   变量 n
  位置: 类 Main
0_0_35653402_19738\Main.java:13: 错误: 找不到符号
			double sum =0;csum =0;
			              ^
  符号:   变量 csum
  位置: 类 Main
0_0_35653402_19738\Main.java:25: 错误: 找不到符号
					csum += c[i].credits;
					^
  符号:   变量 csum
  位置: 类 Main
0_0_35653402_19738\Main.java:29: 错误: 找不到符号
				System.out.printf("%.2f",sum/csum);
				                             ^
  符号:   变量 csum
  位置: 类 Main
4 个错误


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