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已知检查括号匹配及注释、字符串处理的C源程序如下： #include＜stdio.h＞ int brace，brack，paren； void in_quote(int c)； void in_comment(void)； void search(int c)； /*rudimentary syntax checKer for C program*/ int main() { int c； extern int brace，brack，paren； while((c=getchar())!=EOF){ if(c==’/’){ if((c=getchar())==’*’) in_comment()； /*inside comment*/ else search(C) ； }else if(c==’\"||c=="") in_quote(c)； /*inside quote*/ else search(c)； if(brace＜0){ /*output errors*/ printf("Unbalanced braces\n")； brace=0； }else if(brack＜0){ printf("Unbalanced brackets\n")； brack=0； }else if(paren＜0){ printf("Unbalanced parentheses\n")； paren=0； } } if(brace＞0) /*output errors*/ printf("Unbalanced braces\n")； if(brack＞0) printf("Unbalanced brackets\n")； if(paren＞0) printf("Unbalanced parentheses\n")； return 0； } /*search：search for rudimentary syntax errors*/ void search(int c) { extern int brace，brack，paren； if(c==’{’) ++brace； else if(c==’}’) --brace； else if(c==’[’) ++brack； else if(c==’]’) --brack； else if(c==’(’) ++paren； else if(c==’)’) --paren； } /*in_comment：inside of a valid comment*/ void in_comment(void) { int c，d； c=getchar()； d=getchar()； /*curr character*/ while(c!=’*’||d!=’/’){ /*search for end*/ c=d； d=getchar()； } } /*in_quote：inside quote*/ void in_quote(int c) { int d； while((d=getchar())! =c) /*search end quote*/ if(d==’\\’) getchar()； /*ignore escape seq*/ } 设计一组测试用例，使该程序所有函数的语句覆盖率和分支覆盖率均能达到100%。如果认为该程序的语句覆盖率或分支覆盖率无法达到100%，需说明为什么。
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