回答編集履歴
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コード追加
test
CHANGED
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@@ -1 +1,67 @@
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includeの頭に#がないとか？
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自分はこれでいけた。
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```
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#include<stdio.h>
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#include<math.h>
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int main(){
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double a[4][4]={{2,-2,4,2},{2,-1,6,3},{3,-2,12,12},{-1,3,-4,4}};
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double det=1.0,buf;
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int n=4; //配列の次数
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int i,j,k;
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//三角行列を作成
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for(i=0;i<n;i++){
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for(j=0;j<n;j++){
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if(i<j){
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buf=a[j][i]/a[i][i];
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for(k=0;k<n;k++){
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a[j][k]-=a[i][k]*buf;
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}
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}
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}
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}
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//対角部分の積
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for(i=0;i<n;i++){
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det*=a[i][i];
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}
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printf("%f\n",det); // -> 120.000000
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return 0;
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}
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```
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