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p=(float*)malloc(sizeof(float[M]));
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p=(float*)malloc(sizeof(int[M][N]));
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int i;
int **p;
p=(int*)malloc(sizeof(int)*M);/*¸øÐзÖÅä¿Õ¼ä*/
for(i=0;i<M;i++)
{
     p[i]=(int*)malloc(sizeof(int)*N);/*¸øÁзÖÅä¿Õ¼ä*/
}
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