if()里面能再嵌套if()语句吗？？ 在IF语句里面可以嵌套循环吗？！
\u6c42\u89e3else if\u91cc\u8fd8\u80fd\u518d\u5d4c\u5957if\u8bed\u53e5\u5417\u5728C\u8bed\u8a00\u4e2d\uff0cif...else\u5206\u652f\u8bed\u53e5\u4e0efor\u5faa\u73af\u8bed\u53e5\u548c\u5176\u4ed6\u5faa\u73af\u53ca\u5206\u652f\u90fd\u662f\u53ef\u4ee5\u5d4c\u5957\u4f7f\u7528\u7684\uff0c\u4e5f\u5c31\u662f\u8bf4\u5728if\u8bed\u53e5\u540e\u9762\u548celse\u8bed\u53e5\u540e\u9762\u90fd\u662f\u53ef\u4ee5\u4f7f\u7528for\u5faa\u73af\u8bed\u53e5\u7684\uff0c\u4f8b\u5982\uff1a
\u7ed9\u5b9a\u4e00\u4e2a\u6574\u6570n\uff0c\u5224\u65ad\u8fd9\u4e2a\u6574\u6570n\u662f\u4e0d\u662f\u5c0f\u4e8e2\uff0c\u5982\u679c\u5c0f\u4e8e2\u5219\u63d0\u793a\u7ed9\u5b9a\u6570\u503c\u4e0d\u5728\u6709\u6548\u8303\u56f4\u5185\uff0c\u5426\u5219\u8ba1\u7b97\u4ece1\u5230n\u7684\u7d2f\u52a0\u548c\u3002
int sum=0;
if(n<2){
printf("\u7ed9\u5b9a\u6570\u503c\u4e0d\u5728\u6709\u6548\u8303\u56f4\u5185");
}else{
for(int i=1;i<=n;i++){sum = sum +i;}
printf("%d",sum);
}
IF\u672c\u8eab\u53ea\u662f\u5224\u65ad\u8bed\u53e5\uff0c\u91cc\u9762\u53ef\u4ee5\u6709\u5faa\u73af\u8bed\u53e5\uff0c\u5f53\u7136\u4e5f\u53ef\u5d4c\u5957\u5faa\u73af\u3002
\u5176\u5b9e\uff0cIF\u548c\u5faa\u73af\u5d4c\u5957\u6ca1\u4ec0\u4e48\u5173\u7cfb\uff0c\u4e0d\u5b58\u5728\u53ef\u4e0d\u53ef\u4ee5\u7684\u95ee\u9898\u3002
\u4f60\u4e0d\u4f1a\u662f\u60f3\u95ee IF \u91cc\u662f\u5426\u80fd\u5d4c\u5957IF\u5427\uff1f \uff08\u8fd9\u4e2a\u5f53\u7136\u4e5f\u80fd\uff09
可以...随便你不过 标准C类语言是 else if ... 意思是if () {} else { if () { }}==>if () {} else if () {}
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