You do it exactly the same way
int marr[10][10] = {0};
Edit:
This is a C solution. For a C++ solution you can go for:
int marr[10][10] = {};
These 2 solutions do not work for arrays that have size defined via variables. e.g.:
int i, j = 10;
int marr[i][j];
To initialize such an array in C++ use std::fill
.
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